Mg II h + k flux-rotational period correlation for G-type stars

Manuel Olmedo, Miguel Chávez, Emanuele Bertone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


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
Title of host publicationNew Quests in Stellar Astrophysics III: A Panchromatic View of Solar-Like Stars, With and Without Planets
EditorsM. Chavez, E. Bertone, O. Vega, V. De la Luz
PublisherPublications of the Astronomical Society of the Pacific
Number of pages7
Publication statusPublished - Dec 2013
Externally publishedYes

Publication series

NamePublications of the Astronomical Society of the Pacific
PublisherUniversity of Chicago
ISSN (Print)0004-6280

Bibliographical note

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

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this