Near-infrared photometry of HDE 245770 /A 0535 + 26/

Details Near-infrared photometry of HDE 245770 /A 0535 + 26/ Near-infrared photometry of HDE 245770 /A 0535 + 26/

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..293p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 293-298.

Astronomy and Astrophysics

Astronomy

19

B Stars, Infrared Photography, Infrared Photometry, Ionized Gases, O Stars, Stellar Envelopes, Ubv Spectra, Balloon-Borne Instruments, Energy Distribution, Flux Density, Near Infrared Radiation, Stellar Mass Ejection, Stellar Spectra, Stellar Winds, X Ray Sources

Scientific paper

The optical-infrared energy distribution of the OBe star HDE 245770, the optical counterpart of the transient X-ray source A 0535 + 26, is derived by using infrared observations made in the period from November 1976 to March 1977 and UBV photometry obtained in November 1976. An infrared excess is evident with flux density proportional to about the 0.6 power of frequency. The excess is explained in terms of thermal free-free emission from an ionized gaseous envelope around the OBe star. By assuming a matter outflow through the envelope with uniform velocity of a few hundred km/s, a value of about 1 millionth of a solar mass per year is obtained for the mass-loss rate in HDE 245770.

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