J/AJ/112/491 Late-Type Stars in M31. II. (Brewer+ 1996)
Late-Type Stars in M31. II. C-, S-, and M-Star Spectra
Brewer J.P., Richer H.B., Crabtree D.R.
<Astron. J. 112, 491 (1996)>
=1996AJ....112..491B 1996AJ....112..491B
ADC_Keywords: Stars, late-type ; Spectroscopy
Abstract:
We present spectra of AGB stars in M31 for which observations had been
previously secured using a four-band photometric system (FBPS). The
FBPS had been used to identify M-, S-, and carbon-star (C-star)
candidates, and we use the spectra to show that the FBPS did an
excellent job at identifying C- and M-stars. Of the 48 C-stars for
which spectra were obtained, 7 have strongly enhanced 13C bands
(J-stars), 2 have strong Halpha emission, while 3 are found to exhibit
enhanced Li absorption (Li-stars). Both the J- and Li-stars are
fainter than predicted by current theoretical models, while the colors
of the Halpha stars suggest they may be in the terminal phases of
their evolution. The C2 and CN band strengths of the C-stars are
measured, and no correlation between these band strengths and either
Mbol or (V-I) is found. It is suggested that this lack of correlation
is due to an age spread. The spectra of the first confirmed S-star in
M31 is presented, and two evolutionary pathways are suggested to
account for this star's high luminosity.
Description:
The files with the prefix CFHT contain the M31 spectra, the files
files with the prefix DAO contain spectra of Galactic carbon stars.
See the text of the printed paper for details.
Only encapsulated PostScript version of the spectra are available.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cfht01.eps 102 9926 F3-1.1, F3-2.1 and F3-3.1 spectra
cfht02.eps 102 9981 F3-4.1, F3-5.1 and F3-5.2 spectra
cfht03.eps 102 10897 F3-7.1, F3-8.1 and F3-8.2 spectra
cfht04.eps 102 10903 F3-9.1, F3-10.1 and F3-11.1 spectra
cfht05.eps 102 10606 F3-11.2, F3-12.1 and F3-13.1 spectra
cfht06.eps 102 9657 F3-13.2, F3-14.1 and F3-14.2 spectra
cfht07.eps 102 9459 F3-15.1, F3-15.2 and F3-16.1 spectra
cfht08.eps 102 9486 F3-17.1, F3-18.1 and F3-18.2 spectra
cfht09.eps 102 9032 F3-19.1, F3-20.1 and F3-20.2 spectra
cfht10.eps 102 8060 F3-21.1, F3-22.1 and F3-23.1 spectra
cfht11.eps 102 8242 F3-24.2, F3-25.1 and F3-26.1 spectra
cfht12.eps 102 9063 F3-27.1, F3-28.1 and F3-29.1 spectra
cfht13.eps 102 7969 F3-31.1, F3-32.1 and F3-32.2 spectra
cfht14.eps 102 7681 F3-33.1, F3-33.2 and F3-34.1 spectra
cfht15.eps 102 7862 F3-35.1, F3-36.1 and F3-36.2 spectra
cfht16.eps 102 9927 F4-1.1, F4-2.1 and F4-3.1 spectra
cfht17.eps 102 9103 F4-4.1, F4-4.2 and F4-5.1 spectra
cfht18.eps 102 7772 F4-6.1, F4-7.1 and F4-7.2 spectra
cfht19.eps 102 12093 F4-7.3, F4-8.1 and F4-9.1 spectra
cfht20.eps 102 10481 F4-10.1, F4-11.1 and F4-12.1 spectra
cfht21.eps 102 9380 F4-13.1, F4-14.1 and F4-15.1 spectra
cfht22.eps 102 10234 F4-15.2, F4-16.1 and F4-17.1 spectra
cfht23.eps 102 10378 F4-18.1, F4-19.1 and F4-20.1 spectra
cfht24.eps 102 9015 F4-21.1, F4-21.2 and F4-22.1 spectra
cfht25.eps 102 10423 F4-23.1, F4-24.1 and F4-25.2 spectra
cfht26.eps 102 11595 F4-26.1, F4-27.1 and F4-28.2 spectra
cfht27.eps 102 10354 F4-29.1, F4-30.1 and F4-31.1 spectra
cfht28.eps 102 7016 F4-32.1, F4-33.1 and F4-34.1 spectra
cfht29.eps 102 7142 F4-35.1, F4-36.1 and F4-37.1 spectra
dao01.eps 102 8244 AW-Cyg, HK-Lyr and RS-Cyg spectra
dao02.eps 102 8173 RY-Dra, SS-Vir and T-Lyn spectra
dao03.eps 102 8218 T-Lyr, UX-Dra and U-Cyg spectra
dao04.eps 102 8030 V-Aql, V-Oph and X-Cnc spectra
dao05.eps 102 3139 Y-CVn spectrum
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See also:
J/AJ/109/2480 : Late-type stars in M31. I. (Brewer+ 1995)
Origin: AAS CD-ROM series, Volume 7, 1996 Lee Brotzman [ADS] 10-Aug-1996
(End) [CDS] 30-Jan-1997