Direct evidence for a polar spot on SV Camelopardalis

S V Jeffers, A C Cameron, J R Barnes, J P Aufdenberg, G A J Hussain

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We have used spectrophotometric data from the Hubble Space Telescope (HST) to eclipse-map the primary component of the RS CVn binary SV Cam over nine HST orbits. We find from these observations and the Hipparcos parallax that the surface flux in the eclipsed low-latitude region of the primary is about 30% lower than that computed from a PHOENIX model atmosphere at the effective temperature that best fits the spectral energy distribution of the eclipsed flux. This can only be accounted for if about a third of the primary's surface is covered with unresolved dark starspots. Extending this to the full surface of the primary, we find that, even taking into account this spot-filling factor, there is an additional flux deficit on the primary star. This can only be explained if there is a large polar spot on the primary star extending from the pole to latitude 48degrees +/- 6degrees.

Original languageEnglish
Pages (from-to)425-431
Number of pages7
JournalAstrophysical Journal Letters
Volume621
Publication statusPublished - 1 Mar 2005

Keywords

  • binaries : eclipsing
  • stars : activity
  • stars : individual (SV Camelopardalis)
  • stars : late-type
  • stars : spots
  • STELLAR SURFACE-STRUCTURE
  • SYMMETRIC MODEL ATMOSPHERES
  • EFFECTIVE TEMPERATURES
  • DIFFERENTIAL ROTATION
  • ACTIVE STARS
  • 6800 K
  • BINARY
  • PARAMETERS
  • PERIOD
  • LIGHT

Fingerprint

Dive into the research topics of 'Direct evidence for a polar spot on SV Camelopardalis'. Together they form a unique fingerprint.

Cite this