CoRoT target HD 51844: A δ Scuti star in a binary system with periastron brightening

Markus Hareter, Margit Paparó

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


The star HD 51844 was observed in the CoRoT LRa02 as a target in the seismology field, which turned out to be an SB2 system. The 117-day light curve revealed δ Scuti pulsations in the range of 6 to 15 d-1 where four frequencies have amplitudes larger than 1.4 mmag, and a rich frequency spectrum with amplitudes lower than 0.6 mmag. Additionally, the light curve exhibits a 3-mmag brightening event recurring every 33.5 days with a duration of about 5 days. The radial velocities from spectroscopy confirmed that the star is an eccentric binary system with nearly identical masses and physical parameters. The brightening event in the light curve coincides with the maximum radial-velocity separation showing that the brightening is in fact caused by tidal distortion and/or reflected light. One component displays large line-profile variations, while the other does not show significant variation. The frequency analysis revealed a quintuplet structure of the four highest-amplitude frequencies, which is due to the orbital motion of the pulsating star.

Original languageEnglish
Title of host publicationPrecision Asteroseismology
EditorsJoyce Guzik, William Chaplin, William Chaplin, Gerald Handler, Andrzej Pigulski
Number of pages4
Publication statusPublished - Mar 3 2014

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • binaries: spectroscopic
  • stars: individual: HD 51844
  • stars: variables: δ Scuti

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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    Hareter, M., & Paparó, M. (2014). CoRoT target HD 51844: A δ Scuti star in a binary system with periastron brightening. In J. Guzik, W. Chaplin, W. Chaplin, G. Handler, & A. Pigulski (Eds.), Precision Asteroseismology (S301 ed., pp. 59-62). (Proceedings of the International Astronomical Union; Vol. 9, No. S301).