Talk:V1045 Sco

V1045_Sco is a nice one. Essentially nothing in the literature. Worth to follow up. B-V~1.8 (from simbad) points to a much later type then K5. Maybe even K8 is not late enough... For such late types, the (strong) Li is a very significant youth indicator. Moreover, I believe that this star has mid-IR excess, pointing towards circumstellar material. This could also explain the strange, self-absorbed, Halpha.

Now, IRAS (12mu) flux is about 2Jy. (*IF* IRAS is not wrong...) That amount of photospheric emission (constrained by a Vmag=8.1, again from Simbad) is only possible, if the star has approx Teff=3000K, in contradiction to being K type (T=3000 is late M!). (play yourself: http://www.stsci.edu/hst/nicmos/tools/conversion_form.html )

This star apparently escaped generic weak-line T Tauri searches: it is NOT an X-ray (ROSAT) source.

now, what I would suggest is to measure and monitor its radial velocity, and to continue to observe it a couple of times (if it is not variable in RV). In case it has variable RV, we should aim for an orbit. (it could be an SB, given the strange colors etc).


 * Hi Michael - great that you like V1045 Sco! Just one question: Did you check the HIPPARCOS parallax? To check if the distance/luminosity looks reasonable.


 * The spectral type could perhaps be a bit later, but it is without a doubt a K-star! No TiO bands visible, and the line ratios also rule out M-type. Note that we have two FEROS spectra, and they show no RV variation (based on a quick-look... we will know better when the CCF for FEROS is working). Also the line shapes (H-alpha) look the same, only thing changing is the amount of CaII H+K emission.


 * To observe it further I quote my email: "We have two non-exclusive easy options to get more data on this object: (1) I will ask for it as an additional target for my March HARPS run, and (2) allow Oliver Schuetz to include it in his VISIR proposal for imaging and spectroscopy to study the dust properties."  At the moment, we're still awaiting answers.   In any case I will include it in my March 2007 run. Tdall 20:40, 25 September 2006 (CLT)


 * just to sum up, that Oliver has now joined VSOP, and that his program (which is not a VSOP program) has been submitted with V1045 Sco as one of the targets. VSOP'ers on the proposal are: Oliver, Michael, Thomas, Lorenzo. We are still waiting for news... -- Tdall 00:24, 7 November 2006 (CLST)