J/A+A/561/A47 8.1um SiO spectra of cool evolved stars (Ohnaka, 2014)
High spectral resolution spectroscopy of the SiO fundamental lines in red giants
and red supergiants with VLT/VISIR.
Ohnaka K.
<Astron. Astrophys. 561, A47 (2014)>
=2014A&A...561A..47O 2014A&A...561A..47O
ADC_Keywords: Stars, late-type ; Stars, giant ; Stars, supergiant ;
Spectra, infrared ; Abundances
Keywords: infrared: stars - techniques: spectroscopic -
stars: AGB and post-AGB - stars: late-type - stars: atmospheres -
supergiants
Abstract:
The mass-loss mechanism in red giants and red supergiants is not yet
understood well. The SiO fundamental lines near 8 m are potentially
useful for probing the outer atmosphere, which is essential for
clarifying the mass-loss mechanism. However, these lines have been
little explored until now.
We present high spectral resolution spectroscopic observations of the
SiO fundamental lines near 8.1um in 16 bright red giants and red
supergiants. Our sample consists of seven normal (i.e., non-Mira)
K-M giants (from K1.5 to M6.5), three Mira stars, three optically
bright red supergiants, two dusty red supergiants, and the enigmatic
object GCIRS3 near the Galactic center.
Description:
Calibrated 8.1 micron SiO fundamental line spectra of 16 red giants
and red supergiants. The observations were carried out with the mid-IR
instrument VISIR at the Very Large Telescope with a spectral
resolution of 30000. The data were taken on 2011 April 19. The flux is
normalized to unity in the continuum. The wavelength scale is in the
laboratory frame except for GCIRS3, for which the wavelength scale is
in the heliocentric frame because the systemic velocity of this object
is unknown. The wavelengths severely affected by telluric lines are
excluded.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 73 16 List of studied stars
sp/* . 16 Individual spectra
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See also:
J/AJ/142/103 : Cool evolved stars in SAGE-SMC (Boyer+, 2011)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name Star name
15- 16 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
18- 19 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
21- 25 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
27 A1 --- DE- Simbad Sign of the Declination (J2000.0)
28- 29 I2 deg DEd Simbad Degree of Declination (J2000.0)
31- 32 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
34- 37 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
39- 43 F5.2 mag Bmag ? Simbad B band magnitude
45- 49 F5.2 mag Vmag ? Simbad V band magnitude
52- 61 A10 --- SpType MK spectral type from table 1
63- 73 A11 --- FileName Name of the spectrum file in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 8 F8.6 um lambda [8.086/8.113] Wavelength in micron
10- 15 F6.4 --- Flux Normalized flux
17- 25 E9.4 --- e_Flux Error in the normalized flux
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Acknowledgements:
Keiichi Ohnaka, kohnaka(at)mpifr-bonn.mpg.de
Max Planck Institute for Radio Astronomy
(End) Keiichi Ohnaka [Max Planck Inst.], Patricia Vannier [CDS] 05-Dec-2013