2002A&A...396..967P


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:41:14

2002A&A...396..967P - Astronomy and Astrophysics, volume 396, 967-975 (2002/12-4)

Carbon monoxide bands in M dwarfs.

PAVLENKO Y.V. and JONES H.R.A.

Abstract (from CDS):

We compare the observational and theoretical spectra of the Δv = 2 CO bands in a range of M dwarfs. We investigate the dependence of theoretical spectra on effective temperatures as well as carbon abundance. In general we find that the synthetic CO bands fit the observed data extremely well and are excellent diagnostics. In particular the synthetic spectra reasonably match observations and the best fit temperatures are similar to those found by empirical methods. We also examine the 12C/13C isotopic ratio. We find that fundamental 13CO bands around 2.345 and 2.375µm are good discriminators for the 12C/13C ratio in M dwarfs. The 2.375µm band is more useful because it doesn't suffer such serious contamination by water vapour transitions. Our current dataset does not quite have the wavelength coverage to perform a reliable determination of the 12C/13C ratio in M dwarfs. For this we recommend observing the region 2.31-2.40µm at a resolution of better than 1000. Alternatively the observational problems of contamination by water vapour at 2.345µm maybe solved by observing at resolutions of around 50000. We also investigated the possibility of using the Δv=1 CO bands around 4.5µm. We find that the contamination due to water vapour is even more of a problem at these wavelengths.

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Journal keyword(s): stars: fundamental parameter

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 dM6 639 0
2 HD 95735 Er* 11 03 20.19400 +35 58 11.5682 10.030 8.960 7.520 5.99 4.79 M2+V 636 0
3 LP 271-25 LM* 14 28 43.2272685950 +33 10 39.245755294   21.2   17.8   M9Ve 234 0
4 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 679 2
5 VB 10 Er* 19 16 57.6103282334 +05 09 01.588675251     17.30     M8V 441 1

    Equat.    Gal    SGal    Ecl

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