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    • HD 147010: The Ap star in the reflection nebula vdB 102 in upper Scorpius region

      N. Kameswara Rao R. Rajamohan

      Volume 3 Issue 3 September 1982 pp 267-276

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/003/03/0267-0276

    • Keywords

       

      peculiar stars; spectrum variables

    • Abstract

       

      HD 147010, which is in the reflection nebula vd B 102, has been found to be a hot Ap silicon star rather than a normal A supergiant. From theUBV and JHK photometry of the star, colour excessE(B - V) of 0.29 and the ratio of total-to-selective absorptionR of 4.3 have been obtained. The high value ofR implies bigger grain size and also confirms the association of the star with the nebula. The dereddened colours of the star can be fitted to a theoretical energy distribution with Teff = 13000 ± 500 K and logg = 3.6 ± 0.2. HD 147010 has also been found to be a spectrum variable; in particular, lines of Cr II show large intensity variations.

    • Author Affiliations

       

      N. Kameswara Rao1 R. Rajamohan1

      1. Indian Institute of Astrophysics, Bangalore - 560034

    • Dates

       
      Published
      September 1982
      Manuscript received
      17 March 1982
      Accepted
      1 July 1982

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