New Precision Orbits Of Bright Double-Lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, And HR 8467

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dc.contributor.utaustinauthorTomkin, Jocelynen_US
dc.creatorFekel, Francis C.en_US
dc.creatorTomkin, Jocelynen_US
dc.creatorWilliamson, Michael H.en_US
dc.creatorPourbaix, Dimitrien_US
dc.date.accessioned2016-04-22T19:45:38Z
dc.date.available2016-04-22T19:45:38Z
dc.date.issued2011-09en
dc.description.abstractImproved orbital elements for three double-lined spectroscopic binaries, 47 And, 38 Cas, and HR 8467, have been determined with extensive new radial velocities. For 38 Cas lines of the secondary have been detected for the first time. Given the orbital periods for these systems of 35.3682, 134.130, and 42.3813 days, respectively, it is not surprising that all three have either moderate or relatively high eccentricities. The orbital dimensions (a(1) sin i and a(2) sin i) and minimum masses (m(1) sin(3) i and m(2) sin(3) i) have accuracies of 0.5% or better. An astrometric orbit for 38 Cas, which was recomputed with Hipparcos astrometry and our new spectroscopic orbital elements, produces a very high orbital inclination of 88 degrees +/- 5 degrees. We have found no evidence for eclipses in either 38 Cas or HR 8467. We estimate that both components of 38 Cas are slightly metal poor with [Fe/II] = -0.3. The two components of 47 And are Am main-sequence stars, while our spectral types for 38 Cas are F6 dwarf and G5 dwarf for its primary and secondary, respectively. For HR 8467 we determined spectral types of F6 subgiant and F6 dwarf for the components. The primary of HR 8467 is likely just beginning to traverse the Hertzsprung gap and is rotating more slowly than its pseudosynchronous velocity, while the main-sequence secondary is rotating pseudosynchronously. On the other hand, the binary components of 47 And and 38 Cas are rotating significantly faster than their pseudosynchronous velocities.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASAen_US
dc.description.sponsorshipNSFen_US
dc.description.sponsorshipTennessee State Universityen_US
dc.description.sponsorshipState of Tennessee through its Centers of Excellenceen_US
dc.identifierdoi:10.15781/T2ZV3H
dc.identifier.citationFekel, Francis C., Jocelyn Tomkin, Michael H. Williamson, and Dimitri Pourbaix. >New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, and HR 8467.> The Astronomical Journal, Vol. 142, No. 3 (Sep., 2011): 69.en_US
dc.identifier.doi10.1088/0004-6256/142/3/69en_US
dc.identifier.issn0004-6256en_US
dc.identifier.urihttp://hdl.handle.net/2152/34401
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectbinaries: spectroscopicen_US
dc.subjectstars: fundamental parametersen_US
dc.subjectstars:en_US
dc.subjectindividual (47 and, 38 cas, hr 8467)en_US
dc.subjectmk spectral typesen_US
dc.subjectspeckle interferometryen_US
dc.subjectrotational velocitiesen_US
dc.subjectven_US
dc.subjectstarsen_US
dc.subjectf-typeen_US
dc.subjectclassificationen_US
dc.subjecttelescopeen_US
dc.subjectmagnitudeen_US
dc.subjectcatalogen_US
dc.subjectsystemsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleNew Precision Orbits Of Bright Double-Lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, And HR 8467en_US
dc.typeArticleen_US

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