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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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 found 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 rotational period. The comparison of UV-predicted rotational periods with those derived from empirical Prot - Ca II H+K flux calibrations are consistent, with some scatter at large periods, where the emission are less intense. We present newly derived rotational periods for 15 G-type stars.
Original languageEnglish
Pages (from-to)1436
JournalPublications of the Astronomical Society of the Pacific
Issue number934
Publication statusPublished - 1 Dec 2013
Externally publishedYes

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