BARLOW, MJ;
COHEN, M;
(1977)
Infrared photometry and mass loss rates for OBA supergiants and Of stars.
Astrophysical Journal
, 213
pp. 737-755.
10.1086/155204.
Preview |
Text
barlow_cohen77_ApJ213_737.pdf - Published Version Download (2MB) | Preview |
Abstract
We present infrared observations of 34 OBA supergiants and 10 Of and Oe stars. Excess free- free emission is detectable at 10 m but not at shorter wavelengths for the supergiants. From our 2.2 and 3.6 t m photometry of the supergiants, in conjunction with existing UBV data, we derive an invariant ratio of total to selective extinction, R = 3.10 + 0.03. Using published radio and infrared data, we derive the velocity law for the mass loss outflow from P Cygni, and we apply this velocity law to the measured 10 m excess fluxes from our sample of supergiants in order to derive mass loss rates. Our preliminary survey of Of and Oe stars shows excess free-free emission to be common at 3.6 m and sometimes detectable at 2.2 t m. Using our 2.2-10 m data, we derive mass loss rates for several 0 stars. Our results are consistent with radiation pressure being the driving mechanism for mass loss from OBA supergiants and Of stars. Subject headings: interstellar: matter - stars: circumstellar shells - stars: early-type - stars: mass loss - stars: Of-type - stars: supergiants
| Type: | Article |
|---|---|
| Title: | Infrared photometry and mass loss rates for OBA supergiants and Of stars |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/155204 |
| Publisher version: | https://doi.org/10.1086/155204 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Infrared Astronomy; Infrared Photometry; O Stars; Stellar Mass Ejection; Stellar Spectrophotometry; Supergiant Stars; A Stars; B Stars; Black Body Radiation; Early Stars; Interstellar Extinction; Mass Flow; Ubv Spectra; Astrophysics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10096231 |
Archive Staff Only
 |
View Item |
