A search for chromospheric emission in A-type stars using the Goddard High-Resolution Spectrograph

Details A search for chromospheric emission in A-type stars using the Goddard High-Resolution Spectrograph A search for chromospheric emission in A-type stars using the Goddard High-Resolution Spectrograph

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..319s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 319-323

Astronomy and Astrophysics

Astronomy

16

A Stars, Carbon, Chromosphere, Ion Irradiation, Main Sequence Stars, Ultraviolet Astronomy, Ultraviolet Emission, Convection Cells, High Resolution, Hubble Space Telescope, Iue, Spectrographs, Stellar Models

Scientific paper

We have used the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) to search for chromospheric emission in the ultraviolet C II 1335 A lines of eight A-type stars. The B-V colors of these stars range from 0.12 to 0.22. We have detected emission in the spectrum of the A7 V star Altair, but in no other star. We present tentative evidence that the emission from Altair is blueshifted by approximately 60 km per sec or more with respect to the photospheric spectrum of this star. We interpret this as expansion and suggest that the base of the A star winds that we have proposed in earlier work may lie within the chromosphere. Together with International Ultraviolet Explorer (IUE) spectra, our observations indicate that in ordinary main-sequence stars the onset of convection zones capable of supporting detectable chromospheres occurs in the close vicinity of B-V = 0.22.

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