VizieR Online Data Catalog: Variable stars in M31 & M33. III. YSGs & RSGs (Gordon+, 2016)
Abstract
Our targets were primarily selected from the published surveys of M31 and M33 for yellow and red supergiants (Drout+ 2009, J/ApJ/703/441; 2012, J/ApJ/750/97; Massey+ 2009, J/ApJ/703/420). Their red and yellow candidates were all chosen from the Local Group Galaxies Survey (LGGS; Massey+ 2007, J/AJ/133/2393).
In addition to the 120 and 135 YSG candidates from the Drout/Massey catalogs of M31 and M33, respectively, we include 18 confirmed YSGs from Humphreys+ (2014, J/ApJ/790/48, Paper II), seven warm hypergiants from Paper I (Humphreys+, 2013ApJ...773...46H), 39 Hα emission stars with intermediate colors from the survey by Valeev+ (2010AstBu..65..140V), and seven Hα emission sources from an unpublished survey by K. Weis (see Paper II). With these catalogs, we assembled a final target list of 124 and 165 candidate YSGs (after cross-identification among the listed works) for spectroscopy from M31 and M33. See section 2.1 for further explanations. Our spectra of the yellow supergiant (YSG) candidates were obtained with the Hectospec Multi-Object Spectrograph on the MMT at Mount Hopkins over several observing sessions in 2013 Sep-Oct, 2014 Nov, and 2015 Sep (R~2000 for blue or ~3600 for red spectra). We did not obtain follow-up spectroscopy of the red supergiant (RSG) candidates; our discussion of them instead relies on published photometry and analysis of their SEDs for circumstellar dust (see Section 4). (8 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- August 2016
- DOI:
- 10.26093/cds/vizier.18250050
- Bibcode:
- 2016yCat..18250050G
- Keywords:
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- Stars: giant;
- Spectral types;
- Photometry: UBVRI;
- Photometry: infrared;
- Extinction