Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..344b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 344-352.
Astronomy and Astrophysics
Astronomy
11
Carbon Stars, Infrared Astronomy, Stellar Evolution, Stellar Spectrophotometry, Light Curve, Stellar Luminosity, Stellar Mass, Stellar Oscillations, Stellar Temperature
Scientific paper
Broad-band photometry from the U band up to 30 μm, carried out over a 4-year period, and spectrophotometry from 1 μm to 13 μm are presented for the carbon star TW Hor. It is found that the star is an SRb variable with a period of 157 days. The observed spectral energy distribution and the known distance of the star are used to determine its effective temperature, Teff = 3250K, its bolometric luminosity, L = 9×103L_sun;, its radius, R = 3×102R_sun; and their variations. The initial mass at the beginning of the AGB phase of the star is deduced from its membership to the cluster NGC 1252. The results are in agreement with the models of pulsation in the nonadiabatic approximation. A raw comparison of the data with theories of stellar evolution is made.
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