Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...451.1041r&link_type=abstract
Astronomy and Astrophysics, Volume 451, Issue 3, June I 2006, pp.1041-1044
Astronomy and Astrophysics
Astrophysics
Occultations, Techniques: High Angular Resolution, Stars: Fundamental Parameters, Stars: Individual: Tu Gem, Stars: Individual: Ss Vir
Scientific paper
Aims.High-angular resolution investigations of carbon stars. Methods. Milliarcsecond resolution observations in the near infrared K band by the method of lunar occultations are presented for the carbon stars TU Gem and SS Vir. Results. Although a companion to TU Gem is known from the Tycho catalogue, we were not able to detect it so we place limits on its K-band brightness. For both stars, we determined accurate values of the angular diameters at the phase of the observation, namely 8.37 ± 0.07 mas and 4.62±0.15 mas for SS Vir and TU Gem. Using distance estimates from the literature, we found that the two stars have radii of about 500 R_&sun; and 250 R_&sun;, respectively. We also computed their effective temperatures. Conclusions. The result for SS Vir (2445 ± 40 K) is in good agreement with estimates, but in the case of TU Gem our value of 3160 ± 110 K requires reconsidering currently available models.
Chandrasekhar T.
Richichi Andrea
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