Talk:Paper One

(NOTE: the following text was moved from the article page --- Tdall 22:09, 8 January 2007 (CLST) )

Paper One on Subversion -- Tdall 22:10, 8 January 2007 (CLST)
Paper One is now on Subversion, so check it out to see how to retrieve and contribute to the text. All other versions floating around on these pages will be removed shortly. The end-of-January submission date seem to hold!

The aims of Paper One
During a small VSOP meeting on September 1, 2006, we agreed to revise the objectives of Paper One. Instead of aiming at complete spectral analysis of all stars, the Paper should concentrate on the variablility typing. The previous aim of Paper One will likely be pursued in what will eventually become Paper Two. Thus, the Outline of Paper One should be as follows:


 * The "Introduction" section of the paper. Presentation of the project: Bacground, motivation, scale, etc.
 * Assigned to: Linda, Cedric, Thomas
 * Delivery to: Thomas
 * Deadline: 2006-09-15
 * The "Observations" and "Data reduction" sections of the paper. Description of observations, instruments, dataflow, etc.
 * Assigned to: Gaspare, John
 * Delivery to: Thomas
 * Deadline: 2006-09-15
 * The Big Table with our collected data for ~150 stars, including RV, spectral type, variability type, binary status. See section below for assignees & deadlines.
 * Discussion of variability typing; our revisions, statistical analysis of differences, the merits of photometry vs spectroscopy, etc. See section below for assignees & deadlines.

The paper will be assembled as we go along, with the circulation of drafts foreseen on the following schedule:
 * Circulation of version 0.1 (Introduction, Observations, Reductions, few table entries)
 * Release planned: 2006-09-16
 * Version 0.2 (including RV's, literature, discussion, plus statistical analysis. The "meat" is in place.)
 * Release planned: 2006-10-11

The Big Table
The Big Table is the centerpiece of the paper. Containing entries for ~150 stars, it will list their
 * RV (see below for assignees & deadlines)
 * Binary status (see RV discussion below for assignees & deadlines)
 * spectral type (as from the quick-look analysis)
 * Assigned to: Thomas
 * Deadline: 2006-10-10
 * variability type
 * Assigned to: Linda, Thomas
 * Deadline: 2006-10-10
 * literature references, including discussion (in subsections of a "Results" or "Discussion" section) where appropriate.
 * Assigned to: Linda, Maarten, Kieran, Valentin
 * Deadline: 2006-10-10

Determination of RV's need specieal consideration. For FEROS we do not yet have a working tool, and for HARPS a lot of the stars with previously unknown RV may need to be run though the DRS again. The following is a breakdown of this process:
 * FEROS RV's:
 * construction of CCF masks (specifications exist).
 * Assigned to: Thomas
 * Deadline: 2006-09-14
 * make CCF software
 * Assigned to: John
 * Deadline: 2006-09-30
 * measure FEROS RV's and determine binary status with new tool
 * Assigned to: John
 * Deadline: 2006-10-10
 * HARPS RV's:
 * identify and submit data to Gaspare for re-reduction
 * Assigned to: Thomas
 * Deadline: 2006-09-28
 * rereduce data to give RV's and binary status. Deliver to Thomas.
 * Assigned to: Gaspare
 * Deadline: 2006-10-10

Variability typing section
To bring all our results and the ideas of the project into context, we will include this section on variability typing, discussing how it is done, what we revised, statistics on descrepancies and general discussion of the merits of photometry vs spectroscopy. If this sounds still a bit loosely defined, rest assured that it will be rock solid once Cedric and Linda has given it some thought! The tasks involved are as follows:
 * Review the variability assignment process
 * Assigned to: Linda, Thomas
 * Deadline: 2006-09-20
 * Write first draft of Section, possibly as a "cook-book" in variability typing.
 * Assigned to: Linda, Cedric (as sparring/reviewer)
 * Deadline: 2006-10-03
 * Write up section for Version 0.2 release
 * Assigned to: Linda, Cedric, Thomas
 * Deadline: 2006-10-10

Summary of tasks
All the tasks of the former Paper One is on hold, except Cross-correlation analysis of FEROS spectra (with modified constraints) and Chi-square minimization procedure (with lower priority). The redefined tasks of the revised Paper One are summarised as follows:
 * Project presentation/"Introduction" section. Due 2006-09-15 (Linda, Cedric, Thomas)
 * "Observations" and "Data Reduction" sections. Due 2006-09-15 (Gaspare, John)
 * Version 0.1 release. Due 2006-09-16 (Thomas)
 * Review of variability assignment process. Due 2006-09-20 (Linda, Thomas)
 * Cook-book of variability typing. Due 2006-10-03 (Linda, Cedric)
 * FEROS RV's and binary status. Due 2006-10-10 (John, Thomas)
 * HARPS revised RV's and binary status. Due 2006-10-10 (Gaspare, Thomas)
 * Spectral types/quick-look analysis. Due 2006-10-10 (Thomas)
 * Variability typing, including discussion thereof. Due 2006-10-10 (Linda, Cedric, Thomas)
 * Literature & references complete. Due 2006-10-10 (Maarten, Kieran, Valentin, Linda)
 * Version 0.2 release. Due 2006-10-11 (Thomas)

Following the release of version 0.2, I foresee an extended period of discussions, refinements, possibly inclusion of more stars as spectra comes in, and possibly some splinter papers on a smaller scale. The aim is to reach a submittable version before mid-November 2006.

The next VSOP paper (formerly Paper One)
For the moment we keep this info on this page, but it will at some point be moved. For your reference, here is the Call for Participation, and the reminder I sent out on April 27 and May 3, 2006 respectively. The discussions following this call can be found in the discussion tab of this page.

Tasks
The tasks that need to be done are the following, in order of urgency (just to remind you):


 * cross-correlation analysis of FEROS spectra to find binaries.
 * development of chi^2 minimization procedures
 * atmospheric parameters from matching with models, further divided as:
 * B-A stars, fitting Balmer lines (?)
 * F-K stars, fitting metallic lines
 * M stars, fitting molecular bands (?)
 * complete literature update on every object
 * statistical analysis of spectral class differences, including comparison with literature classification sources.
 * new attempt to define the likely variability type, based on the spectral properties and the available literature.

Core Teams
The Core Teams listed below have been defined at the present time. The teams should use the linked team page to keep track of their work, to discuss etc. In this way, all information will be in one handy place once we are going to write up the paper. To begin with, only the initial Goals & Methods email I sent out to the individal teams are on the team page.


 * Cross-correlation analysis of FEROS spectra: John (lead), Cedric, Fernando, Thomas


 * Chi-square minimization procedure: Thomas (lead), Cedric, John, Gaspare, Linda, Ivo


 * Atmospheric parameters of VSOP B-A stars: Cedric, Thomas (lead)


 * Atmospheric parameters of VSOP F-G-K stars: Ivo, Thomas (lead)


 * Atmospheric parameters of VSOP M stars: Gaspare (lead), Thomas


 * Cross-check of atmospheric parameters of selected VSOP B-M stars: Pedro (lead), ???


 * Literature update on every object Linda (lead), Valentin, Maarten, Kieran


 * Statistical analysis of spectral class differences: Cedric (lead), ???


 * Determination of variability type: TBD.

General information and Tools
Some of this information has been sent out to the Core Teams individually, but it is kept here as a general repository of references. All relevant information on methods and tools, and links to software, references, etc. are to end up here eventually.


 * DAOSPEC: you have to write to Peter Stetson, see . The easiest way to use it is with my abund_gui program (see below).
 * You'll need the cfitsio libraries to run DAOSPEC. However, you don't really need the SM and IRAF libraries. cfitsio usually comes with scisoft.
 * abund_gui and helper programs (all Perl). The help for abund_gui is unfortunately not really helpful... there are some in-code comments, and some helpful error messages, but it really need to be improved. I will post updates here as I make them. Sorry.
 * You should install the following perl modules needed for abund_gui to run: Tk, PGPLOT, and Astro::FITS::CFITSIO, all available here
 * To play with atmospheric models you need the ATLAS suite for linux, available here. Included is SYNTHE, which makes synthetic spectra.
 * Another tool for making synthetic spectra (which uses ATLAS or MARCS models) is MOOG.

Paper One at v0.3 -- Tdall 23:00, 5 December 2006 (CLST)
I've frozen the wiki-version of Paper One and have taken it offline for easier edit. You can always find the latest version (think "snapshot") [[Media:PaperOne.tar.gz|here (tar.gz)]]. Please send text, comments, etc. directly to me and I'll include it. The plan is to have a more coherent and readable version, including figures, ready by December 28, at which point we should be close to submission.

Review of v.0.2 -- Tdall 02:19, 12 November 2006 (CLST)
I've collected your feedback on Paper One and incorporated (most of) it into the current status of the paper. As usual, you can find it at Source_of_Paper_One and as usual, you can download and compile it by issuing ./GetPaperOne

Section structure is relatively in place, but note that author ordering is still not final!

We are now entering the more serious phase, having a solid skeleton to build on. Towards the next version, which should be ready by Tuesday November 28, I will assign each (sub)section of the paper to one person, who then is responsible for the work on that section. This of course does not mean that each section should be the work of only one person, neither that nobody else are allowed to work on any or all of the sections - this is a team effort, so please keep working in that spirit! The sections and their caretakers are as follows:

1. Introduction  ---  on hold/all 2. The Project   ---  Thomas 3. Observations 3.1. Target selection  --- Thomas 3.2. FEROS             --- John 3.3. HARPS             --- Gaspare 3.4. Dataflow          --- John 4. Results 4.1. Spectral classification --- Thomas 4.2. RV and binary status    --- Gaspare 4.3. Individual cases 4.3.1. BP Psc       --- Linda 4.3.2. V4385 Sgr    --- Lorenzo 4.3.3. NR Peg       --- Kieran 4.3.4. V491 Car     --- Ivo 4.3.5. V1045 Sco    --- Michael 4.3.6. DM Boo       --- Matilde (with aid of Pedro) 4.4. Statistics            --- on hold/all 4.5. VSOP Public Database  --- Cedric 5. Variability typing   --- Linda 6. Future of VSOP       --- on hold/all

I don't know the schedules of all of you, so if you for any reason cannot make it by the deadline, please inform me immediately so I can reassign the section(s). We are aiming at a submission date of mid-January at the latest, in order to have an accepted paper at the next round of proposal deadlines for both ESO and Gemini.

Lastly, would you who have been assigned Paper One sections please acknowledge asap, thanks!

(NOTE: the following text was moved from the article page --- Tdall 14:59, 12 May 2006 (CLT))

This is where we will collect ideas, thoughts and input for the first paper(s). The idea is that everybody can put here their input; what they think should be included, what should not, how much detail we should get into, whether we should aim for simultaneous companion-papers, etc, etc... We have as of today 61 stars, so we can certainly present something...

Discuss everything! From tiny details to the grand strategy!

For your reference, here is the Call for Participation, and the reminder I sent out on April 27 and May 3 respectively.

Input!
My idea: Make a paper for A&A that will Now... comments! -- Tdall 16:29, 18 April 2006 (CLT)
 * present the project, its background, its aims, etc
 * present 'boring' results: stars with revised spectral types and variability types (a table with 61 lines...)
 * a bit more details on a few 'intermediately interesting' stars; e.g. abundance analysis, mutiplicity, special objects (there was a T Tauri star somewhere...)


 * Well I agree that 61 stars seems "enough" to make a paper (I personaly proposed Thomas to do so...), but I am thinking about what we have really. Why 61 stars? We can have a paper presenting the project, with a table of 61 stars and with a title like "Variable Star One-shot Project I: Presentation and first results." But could we do better? I still think we should emphasize the argument of the number of stars observed. So maybe we could prepare a paper, but wait for 100 stars. With such number, we could not only present the project, the table of new variable types, a special section for "interesting individual cases" but also have some statistics about how different are the old and new distribution of variability/spectral types.


 * For instance: how many stars (among 100) are different by 1 or 2 spectral subclass. How many are different by one complete spectral class. How many are completely different? What are the causes for such differences? Actually, for large differences, we should check the paper that is actually at the origin of the old sp. type. Is there any particular reason for a different spec. or var. type that we can identify in many of our stars? In other words: can we identify a bias toward any spec. or var. type/difference?


 * If we are to include these questions, then we need to work a bit more before making the paper. But it will be a much more interesting paper, that could have already a large impact on people studying variable stars, and not only those who study this or this particular star. My 2 cents. -- Cédric 04:22, 19 April 2006 (CLT)


 * I think it will come quite naturally... once we have a draft paper ready, we should be well over 100 stars observed :-) Making statistics on the 'stars observed so far' is a good idea, but keep in mind that it will be preliminary anyway because we will have many more stars coming - so, the 'real', the final statistical analysis will have to wait anyway. But yes, I think we should include it. But whatever we do, it can only be 'preliminary results' at this stage, except of course for the analysis of individual cases.


 * It will certainly take a bit of work to put together, even such a preliminary statistical analysis, but I agree with Cedric it is worth doing it, and to start doing so right away. The first thing however is to do a better spectral typing of the stars we have so far, and not just spectral typing, but atmospheric model fitting to get Teff, log g, etc. This is something I will do, at least for the cooler stars. The hotter stars (A and earlier) I leave to somebody else.... Feel free!  Next step is a deeper digging into the literature about our stars. Then we can start looking at statistics.


 * So four main points to be addressed in the paper: (1) present project background, aim, organisation, (2) revise spectral types, (3) statistical analysis of classification differences and discussion of their causes, (4) presentation of interesting and/or representative cases. -- Tdall 11:26, 19 April 2006 (CLT)


 * Regarding the work that should be done before actually putting the paper together, (2) needs to be done before (3) can be started, while (4) can be done now, and (1) is 'easy'.  I will obviously volunteer to do most of (2), which will involve matching model atmospheres. This is a big job, not least for the many M stars we have collected. Also, there is quite a population of B-A stars, which I have very little experience with. Bottom line: I can't do it alone, so volunteers please!  Any of you VSOP'ers got experience in atmospheric parameter derivation of early type stars?


 * The other part that can be done right away is (4), which initially requires a bit of research and digging into our own observations. We need somebody (more people) to start looking for interestng things, making the most of the single spectrum we have here, and writing up some analysis and conclusions about that object.


 * By the way: we're at 70 stars observed now! -- Tdall 09:43, 27 April 2006 (CLT)

Summary Table
The table below summarizes the properties and results of the stars that could be included in Paper 1. See the new dedicated page.