Hydrogen Deficient Stars and Related Objects: Proceeding of by William P. Bidelman (auth.), Kurt Hunger, Detlef

By William P. Bidelman (auth.), Kurt Hunger, Detlef Schönberner, N. Kameswara Rao (eds.)

The first helium superstar was once came upon in 1942, the 1st clinical assembly at the topic, even though, came about in 1985. The assembly used to be for that reason lengthy late for, meanwhile, a great deal of fabric have been collected by means of a slightly small, yet energetic medical group. consequently, it seemed essential to evaluate the sphere as a way to outline the topic, examine its current prestige and speak about destiny advancements. Hydrogen deficiency is a common phenomenon, taking place in a wide number of stellar and nonstellar gadgets. it may be with ease detected in B stars as those show either hydrogen and helium strains, if the weather are found in considerable quantities. It turns into much less take place in cool stars, the place the temperature is just too low to excite helium and the place one has to plot oblique tools for proving hydrogen deficiency. in actual fact, it was once impossible to debate the entire advanced of hydrogen deficiency, i.e. in either stars and diffuse topic, yet quite to pay attention to the problem of helium stars.

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Extra resources for Hydrogen Deficient Stars and Related Objects: Proceeding of the 87th Colloquium of the International Astronomical Union Held at Mysore, India, 10–15 Nevember 1985

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Partial support of this work by the National Science Foundation (Grant Nos. AST-8018766 and INT-8219240) and by the National Aeronautics and Space Administration (Grant No. NAG5-71) is gratefully acknowledged. REFERENCES Bi de lman" w. P. 1953, Ap. , 117 ~ 25. Bohannon, B. , Bu'/,L. American Astron. Soc. 13, 526. Bond, H. , H. 1976 .. Pub'/,. Astron. Soc. , 905. , and Osterbrock, D. E. 1984~ Ap. J. 2n, 648. , Gidding" J. , and Wilson, R. 1979~ The First Year of IUE, p. 36. Drilling" J. S. 1980, Ap.

B. , Mon. Not. R. Astr. Soc. 208, 25. , D. , R. , W. P. , PubL. Astron. Soc. Pacific 82" 730. Pottasch, S. R. • Lancaster: D. Reidel). Rao, N. " and Venugopal, V. R. 1985, J. Astrophys. Astron. , 101. Schonberner, D. ,. Astron. Astrophys. 44" 383. Schonberner, D. , Astron. Astrophys. 57, 437. Schonberner, D. 1978, Mitt. Astron. GeseUschaft 43" 266. Schonberner, D. , Astron. Astrophys. 103'1 119. , and Drilling" J. S. 1983, Ap. J. 268, 225. Schonberner,. , and Drilling" J. S. 1984, Ap. J. , 229.

The resulting radial velocities, corrected for the earth's orbital motion, are given in Table I along with those of intervening interstellar Ca II, obtained from measurements of Hand K 23 K. Hunger et al. ), Hydrogen Deficient Stars and Related Objects, 23-27. © 1986 by D. Reidel Publishing Company. 24 J. S. DRILLING AND U. HEBER lines (if visible in the spectrum). 15 A) spectra of extreme helium stars were also obtained with the 4 m telescope, Echelle spectrograph and Singer image-tube camera at CTIO for those stars marked with asterisks in Table Ia).

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