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DEEPTHI S. PRABHU
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Volume 42 All articles Published: 2 July 2021 Article ID 0066 SCIENCE RESULTS
DEEPTHI S. PRABHU ANNAPURNI SUBRAMANIAM SNEHALATA SAHU
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 atshorter 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 $\sim 2.7'\times 2.7'$) and ground-based optical photometry for the outer parts of the cluster. We generate the Far-UV (FUV)–optical colour-magnitude diagrams (CMDs) and in these we find a population of hot EHB stars fainter thanthe zero-age horizontal branch (ZAHB) model. A comparison of our FUV magnitudes of the already reported variable EHB stars (vEHBs) shows that the longest period vEHBs are the faintest, along with a tentative correlation between rotation period and UV magnitude of spotted stars. In order to firmly establish anycorrelation, further study is essential. -
Volume 42 All articles Published: 3 September 2021 Article ID 0101 CORRECTION
DEEPTHI S. PRABHU ANNAPURNI SUBRAMANIAM SNEHALATA SAHU
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Journal of Astrophysics and Astronomy
Volume 43, 2022
All articles
Continuous Article Publishing mode
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Journal of Astrophysics and Astronomy | News
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Continuous Article Publication
Posted on January 27, 2016Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.
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Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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