UV photometry of spotted stars in the horizontal branch of the globular cluster NGC 2808 using AstroSat
Abstract
A recent study of hot (20,000 to 30,000 K) extreme horizontal branch (EHB) stars in globular clusters (GCs) has led to the discovery of their variability. It is suggested that this variability is driven by the projected rotation of magnetic spots on the stellar surfaces and is expected to have higher amplitudes at shorter wavelengths. Here, we present the analysis of such hot stars in the massive GC NGC 2808 using the UltraViolet Imaging Telescope (UVIT), aboard AstroSat. We use the UVIT data in combination with the Hubble Space Telescope UV globular cluster survey (HUGS) data for the central region (within
- Publication:
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Journal of Astrophysics and Astronomy
- Pub Date:
- October 2021
- DOI:
- Bibcode:
- 2021JApA...42...66P
- Keywords:
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- Galaxy: globular clusters: individual (NGC 2808);
- stars: Hertzsprung-Russell and C-M diagrams;
- stars: horizontal-branch;
- stars: variables: general;
- ultraviolet: stars;
- stars: Hertzsprung–Russell and C–M diagrams