Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system

Details Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.336.1043c&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 3, pp. 1043-1048.

Astronomy and Astrophysics

Astronomy

5

Binaries: Spectroscopic, Stars: Fundamental Parameters, Stars: Individual: Hd 7119

Scientific paper

Radial velocity observations of HD 7119 with the CORAVEL instrument at Observatoire de Haute-Provence are reported. Known as an Amδδ Del metallic-line star, HD 7119 was included in our spectroscopic survey of Am-type stars, the purpose of which was to determine the frequency of binaries in this stellar family. This object is found to be a double-lined spectroscopic binary with a variable value of V0, the systematic velocity of the centre of gravity of the pair. The variation of this parameter is interpreted in terms of the orbital motion of an unseen third body with a much longer period. The orbital elements were derived for both the short- and the long-period orbits. These orbits can be considered to be well determined since these observations were performed on a regular basis over the 1992-1998 period, covering more than 320 orbital cycles for the short-period (P= 6.76 d) and 1.3 cycle for the long-period orbit (P~ 1700 d). As deduced from the ratio of the correlation dip areas, the magnitude difference of the components of the short-period system is 0.7 mag. Combined with the Hipparcos data, this value leads to visual absolute magnitudes of 0.5 and 1.2 for the primary and secondary components, respectively. Such magnitudes are consistent with evolved δ Del-type stars. The third body could be a cool dwarf star with a minimum mass of 0.5 Msolar, located at ~ 0.016 arcsec of the main system. Consequently, it cannot be the visual companion detected by Couteau with a separation of 3.35 arcsec. If this latter visual component were a physical component (rather than an optical one), HD 7119 would be a quadruple system.

Affiliated with

Also associated with

No associations

Rating

Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contribution to the search for binaries among Am stars - III. HD 7119: a double-lined spectroscopic binary and a triple system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-950527