On interstellar Fe X forbidden line absorption toward Cepheus OB2

Details On interstellar Fe X forbidden line absorption toward Cepheus OB2 On interstellar Fe X forbidden line absorption toward Cepheus OB2

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284l..47h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. L47-L50.

Astronomy and Astrophysics

Astronomy

11

B Stars, Interstellar Extinction, O Stars, Stellar Spectra, X Ray Astronomy, Forbidden Transitions, Interstellar Gas, Iron, Spectral Line Width

Scientific paper

A weak interstellar absorption line which can be identified as the forbidden line of Fe X 6375 A is observed in the spectrum of the A2 Ia star Nu Cep, which is a member of the Cepheus OB2 association. The equivalent width, width, and radial velocity of the line differ indistinguishably from those of similar absorption previously detected uniquely toward the O6f star Lambda Cep, another association member located at a projected distance of about 50 pc from Nu Cep. The absorption may reveal a particularly dense, low-latitude concentration of hot, foreground interstellar gas of the kind generally responsible for the observed soft X-ray background.

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