Interstellar Molecular Lines in A Stars

Details Interstellar Molecular Lines in A Stars Interstellar Molecular Lines in A Stars

Oct 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968bott....4..233p&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 4, pp. 233-239 (1968) (http://www.astroscu.unam.mx/bott/)

Astronomy and Astrophysics

Astronomy

3

Ism - Molecules, Stars: Early-Type, Ism: Lines And Bands

Scientific paper

Seven A and two B9 stars near the galactic plane were observed spectroscopically in the blue region. Two of these stars and possibly a third one show interstellar lines of CN. From the CN lines of HR 618 an excitation temperature T_E = 3.7 +/- 0.7°K was derived and from HR 1035 a T_E smaller than 4°K was obtained. From the stellar radial velocity, the spectroscopic parallax, and the velocity profile of the interestellar Ca II lines it is argued that HR 618 is located, in the Perseus arm while the CN lines projected on the star originate in the Orion arm, in a region free of ionized hydrogen; these results are in agreement with the "3°K" blackbody radiation field. Interstellar lines of CH+ were also detected in five of these objects. It is shown that at least in two cases the CH+ lines are not circumstellar.

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