Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni

Details Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267...69g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 1/MAR1, P. 69, 1994

Astronomy and Astrophysics

Astronomy

3

Binaries: Spectroscopic - Stars: Individual: Ɛ Cyg

Scientific paper

McMillan et al. have shown from a large number of very precise measurements that the radial velocity of ɛ Cyg has changed by about 0.3 km s-1 over the past five years. We now discuss, on the basis of observations which, although fewer and far less precise, span nearly a century and include continuous coverage by the photoelectric method over the last 25 years, the behaviour of the velocity over the longer term. The star is clearly a spectroscopic binary; there is an unfortunate gap in the radial-velocity data at a critical time, but it seems likely that the period is about 55 yr. It has been possible to derive preliminary orbital elements, which include a high value (0.9) of the eccentricity. The next periastron passage is expected to occur in about 2016; it may be possible to verify the occurrence of the last one if suitable spectrograms taken in the early 1 960s can be located. The companion star is likely to be a main-sequence object of type G, K or early M, and is presently expected to be something like 1 arcsec from the primary; it should be no fainter than twelfth magnitude and may be substantially brighter, so it may be directly detectable.

Affiliated with

Also associated with

No associations

Rating

Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni 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 Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric Radial Velocities - Part Fourteen - Variation of the Radial Velocity of Epsilon-Cygni will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1585312