2003A&A...412..481T


Query : 2003A&A...412..481T

2003A&A...412..481T - Astronomy and Astrophysics, volume 412, 481-494 (2003/12-3)

Optical and near-IR spectra of O-rich Mira variables: A comparison between models and observations.

TEJ A., LANCON A., SCHOLZ M. and WOOD P.R.

Abstract (from CDS):

Pulsation models are crucial for the interpretation of spectrophotometric and interferometric observations of Mira variables. Comparing predicted and observed spectra is one way of establishing the validity of such models. In this paper, we focus on the models published between 1996 and 1998 by Bessell, Hofmann, Scholz and Wood. A few new model spectra are added, to improve available phase coverage. We compare the synthetic spectra with observed low resolution spectra of optically selected oxygen-rich Miras, over a range of optical and near-IR wavelengths that encompasses most of the stellar energy output. We investigate the overall energy distributions, and specific spectral features in the near-IR wavelength range. The agreement between the observed and the model-predicted properties is found to be reasonably good. However, there are discrepancies seen especially in various molecular bands. We find that different combinations of stellar parameters and pulsation phases often result in very similar model spectra. Therefore the problem of deriving parameters of a Mira variable from its spectrum has no unique solution. More advanced models than presently available, providing even better fits to the data and covering a wider range of parameters, would be needed to achieve better discrimination.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: fundamental parameters - stars: late-type - stars: variables: general

Simbad objects: 6

goto Full paper

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1531 0
2 V* R Cha Mi* 08 21 46.4588734296 -76 21 18.302197932   11.94 10.55     M4.5e 60 0
3 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 913 1
4 V* CM Car Mi* 09 47 55.5824251656 -67 27 07.030380348       13.56   M2e 19 0
5 V* RS Hya Mi* 10 51 19.0356495120 -28 37 40.482529176     12 9.57   Me 30 0
6 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2690 1

To bookmark this query, right click on this link: simbad:objects in 2003A&A...412..481T and select 'bookmark this link' or equivalent in the popup menu