J/ApJS/232/16 Mira stars discovered in LAMOST DR4 (Yao+, 2017)
Mira variable stars from LAMOST DR4 data: emission features, temperature types,
and candidate selection.
Yao Y., Liu C., Deng L., de Grijs R., Matsunaga N.
<Astrophys. J. Suppl. Ser., 232, 16-16 (2017)>
=2017ApJS..232...16Y 2017ApJS..232...16Y (SIMBAD/NED BibCode)
ADC_Keywords: Spectroscopy ; Spectral types ; Stars, variable ; Stars, giant ;
Photometry, infrared
Keywords: catalogs; stars: AGB and post-AGB; stars: late-type; stars: statistics
surveys
Abstract:
Based on an extensive spectral study of a photometrically confirmed
sample of Mira variables, we find a relationship between the relative
Balmer emission-line strengths and spectral temperatures of O-rich
Mira stars. The FHδ/FHγ flux ratio increases from less
than unity to five as stars cool down from M0 to M10, which is likely
driven by increasing TiO absorption above the deepest shock-emitting
regions. We also discuss the relationship between the equivalent
widths of the Balmer emission lines and the photometric luminosity
phase of our Mira sample stars. Using our 291 Mira spectra as
templates for reference, 191 Mira candidates are newly identified from
the LAMOST DR4 catalog. We summarize the criteria adopted to select
Mira candidates based on emission-line indices and molecular
absorption bands. This enlarged spectral sample of Mira variables has
the potential to contribute significantly to our knowledge of the
optical properties of Mira stars and will facilitate further studies
of these late-type, long-period variables.
Description:
By the end of 2016 March, the wide-field Large sky Area Multi-Object
fiber Spectroscopic Telescope (LAMOST) DR4 catalog had accumulated
7681185 spectra (R=1800), of which 6898298 were of stars.
We compiled a photometrically confirmed sample of Mira variables from
the Kiso Wide-Field Camera (KWFC) Intensive Survey of the Galactic
Plane (KISOGP; Matsunaga 2017, arXiv:1705.08567), the American
Association of Variable Star Observers (AAVSO) International Database
Variable Star Index (VSX; Watson 2006, B/vsx, version 2017-05-02; we
selected stars of variability type "M"), and the SIMBAD Astronomical
Database.
We first cross-matched the KISOGP and VSX Miras with the LAMOST DR4
catalog. Finally, we cross-matched the DR4 catalog with the SIMBAD
database. See section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 148 191 Mira stars discovered in LAMOST DR4
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
V/153 : LAMOST DR4 (Luo+, 2018)
J/A+AS/105/311 : M giants spectra and photometry (Fluks+, 1994)
J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)
J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996)
J/PASJ/58/529 : SiO Maser Survey in Galactic Bulge (Fujii+, 2006)
J/PASJ/59/559 : SiO maser search off the Galactic plane (Deguchi+, 2007)
J/MNRAS/386/313 : IR observations of Mira variables (Whitelock+, 2008)
J/MNRAS/399/1709 : Near-infrared survey of Miras (Matsunaga+, 2009)
J/PASJ/62/525 : SiO maser survey off the Galactic Plane (Deguchi+, 2010)
J/ApJ/753/90 : Parameters of K5 and later type Kepler stars (Mann+, 2012)
J/ApJ/765/12 : Carbon stars & DQ WDs from SDSS-DR7+DR8 (Green, 2013)
J/other/RAA/15.1154 : M-giant star candidates in LAMOST DR 1 (Zhong+, 2015)
J/MNRAS/455/2216 : Outer bulge O-rich Mira's JHKL photometry (Catchpole+, 2016)
J/ApJS/226/1 : Carbon stars from LAMOST DR2 data (Ji+, 2016)
J/A+A/601/A10 : A grid of MARCS models for S stars (van Eck+, 2017)
http://dr4.lamost.org/ : LAMOST DR4 home page
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 deg RAdeg Right Ascension in decimal degrees (J2000)
14- 23 F10.7 deg DEdeg Declination in decimal degrees (J2000)
25- 43 A19 --- ID Designation (JHHMMSS.ss+DDMMSS.s)
45- 49 I5 d Epoch1 MJD of first LAMOST observation epoch
51- 55 I5 d Epoch2 ? MJD of second LAMOST observation epoch (1)
57- 61 I5 d Epoch3 ? MJD of third LAMOST observation epoch (1)
63- 67 I5 d Epoch4 ? MJD of fourth LAMOST observation epoch (1)
69- 81 A13 --- Type Simbad main type
83- 88 F6.3 mag Jmag [2.5/16.1]? 2MASS J band magnitude
90- 95 F6.3 mag Hmag [1.4/15.8]? 2MASS H band magnitude
97-102 F6.3 mag Ksmag [1/15.8]? 2MASS Ks band magnitude
104-108 F5.3 mag e_Jmag [0.01/0.4]? Uncertainty in Jmag
110-114 F5.3 mag e_Hmag [0.01/0.3]? Uncertainty in Hmag
116-120 F5.3 mag e_Ksmag [0.01/0.4]? Uncertainty in Ksmag
122-127 A6 --- SpT1 Spectral subtype ("Carbon" or M0 to M10) (2)
129-134 A6 --- SpT2 Second spectral subtype ("Carbon" or M0 to
M10) (2)
136-141 A6 --- SpT3 Third spectral subtype ("Carbon" or M0 to M7) (2)
143-148 A6 --- SpT4 Fourth spectral subtype ("Carbon") (2)
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Note (1): For sources observed more than once by LAMOST.
Note (2): Where multiple entries are given for sources with multiple
observations. Temperature types may not be the same in different
observations.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Oct-2017