Semiregular variables of types SRa and SRb. Energy distributions and stellar parameters.

Details Semiregular variables of types SRa and SRb. Energy distributions and stellar parameters. Semiregular variables of types SRa and SRb. Energy distributions and stellar parameters.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..489k&link_type=abstract

Astronomy and Astrophysics, v.308, p.489-496

Astronomy and Astrophysics

Astrophysics

40

Stars: Asymptotic Giant Branch (Agb), Stars: Variables, Stars: Mass-Loss, Infrared: Stars

Scientific paper

Semiregular variables of type SRa and SRb are studied by fitting combinations of blackbodies to new near infrared and IRAS data. The fitted parameters T^*^, T^d^ and R^d^/R^*^ are related to physically meaningful quantities. For the O-rich cases all `blue' objects can be reasonably well approximated by only one blackbody whereas the `red' and the `Mira' SRVs need two. The T^*^ values, reflecting mainly offsetted (-500K), effective temperatures for objects with small to moderate mass loss, are significantly higher in the `blue' SRV cases. A small difference between the T^*^ distributions of `red' and `Mira' SRVs seems to be present: with a few exceptions most of the `Mira' T^*^ values are concentrated in the cold half of the `red' SRV distribution. Carbon-rich objects differ significantly from the O-rich ones in their fit parameters. Sometimes `unphysically' low T^*^ are found - a result of circumstellar reddening in the high mass loss cases. Also lower values of T^d^, accompanied by normal T^*^s and large shell radii are common. S-stars populate a similar region as the optically thin carbon stars.

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