Mg II h + k Flux—Rotational Period Correlation for G-type Stars

Manuel Olmedo, Miguel Chávez, Emanuele Bertone, Víctor De la Luz

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7 Citations (Scopus)
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We present an analysis of the correlation between the mid-UV Mg II h and k emission lines and measured rotational periods of G-type stars. Based on IUE and HST high resolution spectra of a sample of 36 stars, we derive an exponential function that best represents the correlation. We find that the variation of the Mg II h + k fluxes is about a factor of 2.5 larger than that of Ca II H + K, indicating that the UV features are more sensitive to the decline of P rot. The comparison of UV-predicted rotational periods with those derived from empirical P rot - Ca II H + K flux calibrations are consistent, with some scatter at large periods, where the emissions are less intense. We present newly derived rotational periods for 15 G-type stars.

Original languageEnglish
Pages (from-to)1436-1442
Number of pages7
JournalPublications of the Astronomical Society of the Pacific
Issue number934
Publication statusPublished - 1 Dec 2013
Externally publishedYes

Bibliographical note

Copyright 2013 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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