J/AJ/96/1884 BVRJHK photometry of M31 red supergiants (Humphreys+ 1988)
The red supergiants in M31: spectra, colors, and luminosities
Humphreys R.M., Pennington R.L., Jones T.J., Ghigo F.D.
<Astron. J. 96, 1884 (1988)>
=1988AJ.....96.1884H 1988AJ.....96.1884H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, supergiant ; Photometry, infrared
Abstract:
We have surveyed M31 for its most luminous red stars; 300 candidates
were found distributed across the face of the galaxy. JHK infrared
photometry was observed for 57 of the candidates, and far-red
(6800-8800A) spectra were also obtained for 45 stars. We have used the
strength of the Ca II triplet (∼8500A) and the J-H and H-K colors as
luminosity discriminants to separate the supergiants from the
foreground dwarfs. With these criteria, 23 probable late-type
supergiants were identified. We discuss their distribution and
relative numbers of the red supergiants in comparison with the known
WR stars in M31. Accurate extinction and infrared (K=2.2µm) and
bolometric luminosities are also derived from the infrared photometry.
We find that although visually bright red supergiants (MV=-8mag)
exist in M31, the most luminous (Mbol) red supergiants are not found
in the relative numbers we would expect in a galaxy of its size and
mass. It is probable that the rate of massive-star formation is less
in M31, an Sb type spiral, than has been observed in the Sc spirals
and irregulars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 163 332 Red stars in M31: positions, magnitudes,and colors
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See also:
II/144 : Brightest stars in the field of M31 (Berkhuijsen+ 1988)
II/145 : Brightest stars in a foreground field of M31 (Berkhuijsen+, 1988)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star designation (1)
11 I1 h RAh Right ascension (1950)
13- 14 I2 min RAm Right ascension (1950)
16- 19 F4.1 s RAs Right ascension (1950)
21- 22 I2 deg DEd Declination (1950)
24- 25 I2 arcmin DEm Declination (1950)
27- 28 I2 arcsec DEs Declination (1950)
30- 34 F5.2 mag Vmag ? V magnitude
36- 39 F4.2 mag e_Vmag ? rms uncertainty on Vmag
41- 45 F5.2 mag B-V ? B-V color index
47- 50 F4.2 mag e_B-V ? rms uncertainty on B-V
52- 56 F5.2 mag V-R ? V-R color index
58- 61 F4.2 mag e_V-R ? rms uncertainty on V-R
63- 64 I2 yr Year ? Year minus 1900
65 A1 --- n_Year [a] a: average
66- 70 F5.2 mag J-H ? J-H color index
71 A1 --- u_J-H Uncertainty flag on J-H
73- 75 F3.2 mag e_J-H ? rms uncertainty on J-H
77- 81 F5.2 mag H-K ? H-K color index
82 A1 --- u_H-K Uncertainty flag on H-K
84- 86 F3.2 mag e_H-K ? rms uncertainty on H-K
88- 92 F5.2 mag Kmag ? K magnitude
93 A1 --- u_Kmag Uncertainty flag on Kmag
95- 97 F3.2 mag e_Kmag ? rms uncertainty on Kmag
99-101 I3 --- Assoc ? Association number (2)
103-134 A32 --- Rem Remarks
136-142 A7 --- Cat. Catalogue number (3)
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Note (1): Star R-1 has been retried of table1. It has no coordinates because it
is at the edge of plate (the only data is Assoc = 103)
Note (2): Number of association from Van den Berg (1964ApJS....9...65V 1964ApJS....9...65V)
Note (3): Number from Berkhuijsen et al. (1988, Cat. II/144 and II/145)
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History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 17-Apr-1997