J/MNRAS/400/1413 Near-IR spectra of extremely red AGB stars (Wright+, 2009)
Near-IR spectra of IPHAS extremely red Galactic AGB stars. Wright N.J., Barlow M.J., Greimel R., Drew J.E., Matsuura M., Unruh Y.C., Zijlstra A.A. <Mon. Not. R. Astron. Soc. 400, 1413 (2009)> =2009MNRAS.400.1413W
ADC_Keywords: Stars, giant ; Spectra, infrared Keywords: techniques: spectroscopic - atlases - stars: AGB and post-AGB - stars: carbon - stars: chemically peculiar - infrared: stars Abstract: We present a library of 139 near-IR spectra of cool asymptotic giant branch stars that will be useful for comparison with theoretical model atmosphere calculations and for modelling the integrated emission from intermediate-age stellar populations. The source list was selected from the 'extremely red' region of the Isaac Newton Telescope (INT) Photometric Hα Survey (IPHAS) colour-colour plane that is overwhelmingly dominated by very late-type stars. The spectral library also includes a large fraction of S-type and carbon stars. We present a number of spectral classification sequences highlighting the various molecular features identified and discuss a number of rare features with uncertain identifications in the literature. With its focus on particularly cool photospheres, this catalogue serves as a companion to recent spectroscopic atlases of MK standards in the near-IR. Finally, the relationship between IPHAS (r'-i') and (r'-Hα) colours and spectroscopically determined properties is discussed and a strong correlation between the (r'-Hα) colour and the C/O abundance index for S-type and carbon stars is noted. This relation has the potential to separate O-rich, S-type and carbon stars in the Galaxy based on their photometry alone. Description: Spectra of 139 sources were obtained using Long-Slit Intermediate Resolution Infrared Spectrograph (LIRIS), a near-IR camera/spectrometer on the 4.2m William Herschel Telescope (WHT) at the Roque de Los Muchachos Observatory in La Palma, Spain. Observations were performed on five nights in the summers of 2006 and 2007. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 122 140 Sources observed with LIRIS on the William Herschel Telescope (139 from the sample + HIP 71819) sp/* 31 288 *Individual flux densities in zj and hk grism files (wavelength range 880-2300nm)
Note on sp/*: For each ERSO stars, there is one file in zj (ersoNNN_zj.txt) and one file in hk (ersoNNN_hk.txt). For HIP71819, there are 5 files in zj (hip71819zjN.txt) and 5 files in hk (hip71819hkN.txt).
See also: J/A+A/480/409 : IPHAS symbiotic stars candidates (Corradi+, 2008) J/MNRAS/384/1277 : Hα emission line sources from IPHAS (Witham+, 2008) J/A+A/504/291 : IPHAS candidate Planetary Nebulae (Viironen+, 2009) J/MNRAS/397/1685 : Galactic plane IPHAS-POSSI pm survey (Deacon+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [ERSO] 6- 8 I3 --- ERSO ? ERSO sequential number (0 for HIP 71819) 10- 14 A5 --- --- [IPHAS] 16- 34 A19 --- IPHAS IPHAS name of source (JHHMMSS.ss+DDMMSS.s) 36- 37 I2 h RAh Right ascension (J2000) 39- 40 I2 min RAm Right ascension (J2000) 42- 46 F5.2 s RAs Right ascension (J2000) 48 A1 --- DE- Declination sign (J2000) 49- 50 I2 deg DEd Declination (J2000) 52- 53 I2 arcmin DEm Declination (J2000) 55- 58 F4.1 arcsec DEs Declination (J2000) 60- 65 F6.3 mag r'mag ?=- Sloan r' magnitude 67- 72 F6.3 mag i'mag ?=- Sloan i' magnitude 74- 79 F6.3 mag Hamag ?=- IPHAS Hα magnitude 81- 84 F4.1 s zJexp ?=- zJ grism exposure time 86- 90 F5.1 s HKexp ?=- HK grism exposure time 92- 97 A6 --- SpT MK spectral type (1) 100-113 A14 --- Notes Notes on object (2) 115-122 A8 --- Name Name (for HIP 71819)
Note (1): Spectral types for all sources are also listed (only the temperature class is listed since all sources are believed to be giants). * for S-type stars, spectral types are listed as SX/Y, where X is the temperature index (not available for all sources) and Y is the abundance index. * Carbon stars are listed as 'C', as further classification was not possible. * Unclassified O-rich stars are listed as 'K0-M2' * completely unclassified stars are listed as 'U'. * Stars with emission lines are denoted with 'e'. Previous identifications are listed if available from the SIMBAD astronomical data base. Note (2): Variable stars are identified based on the presence of strong water vapour bands. O-rich sources with high C/O ratios (C/O∼0.9-0.95) are identified based on very strong H-band CO lines and no OH lines. Carbon stars with the suspected C2H2 feature in their H-band spectra are also noted.
Byte-by-byte Description of file: sp/*
Bytes Format Units Label Explanations
1- 17 F17.11 0.1nm lambda Wavelength 19- 31 E13.7 --- flux Flux density, in arbitrary units of energy per wavelength interval
Acknowledgements: Nick Wright, nwright(at)head.cfa.harvard.edu
(End) Patricia Vannier [CDS] 28-Dec-2009
|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|