Kavli Affiliate: Huawei Zhang
| First 5 Authors: Hao Wu, Yang Huang, Huawei Zhang, Haibo Yuan, Zhiying Huo
| Summary:
We present systematic identifications of supergiants of M31/M33 based on
massive LAMOST spectroscopic survey. Radial velocities of nearly 5000
photometrically selected M31/M33 supergiant candidates have been properly
derived from the qualified spectra released in LAMOST DR10. By comparing their
radial velocities with those predicted from the rotation curves of M31, as well
as utilizing {it Gaia} astrometric measurements to exclude foreground
contaminations, 199 supergiant members in M31, including 168 `Rank1′ and 31
`Rank2′, have been successfully identified. This sample contains 62 blue
supergiants (BSGs, all `Rank1′), 134 yellow supergiants (YSGs, 103 `Rank1′ and
31 `Rank2′) and 3 red supergiants (RSGs, all `Rank1′). For M33, we identify 84
supergiant members (56 `Rank1′ and 28 `Rank2′), which includes 28 BSGs (all
`Rank1′), 53 YSGs (25 `Rank1′ and 28 `Rank2′) and 3 RSGs (all `Rank1′). So far,
this is one of the largest supergiant sample of M31/M33 with full optical
wavelength coverage (3700 textless $lambda$ textless 9100 AA). This sample
is valuable for understanding the star formation and stellar evolution under
different environments.
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