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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 (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 F/F 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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 148 191 Mira stars discovered in LAMOST DR4
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) 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) : LAMOST DR4 home page Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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 ( 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)
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.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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