14 Ceti

Star in the constellation Cetus J2000 Cetus 00 35 32.833 −00 30 20.20 5.84 subgiant F5 V or F5 IV 0.444 0.006 +11.3 0.2 +143.173 −62.295 17.4181 0.0314 2.26 0.04 1.55 0.1 2.6 10.7 6583 90 commas −0.11 0.06 3.87 0.15 5 2.1 0.4 14 Cet −01°68 2036 3229 2787 143 128843 701 14+Cet 14 Ceti is a single star in the equatorial constellation of Cetus. It is faintly visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.84. The distance to 14 Ceti can be estimated from its annual parallax shift of 17.4 arcsecond, which puts it 187 light years away. It is moving further from the Earth with a heliocentric radial velocity of +11 km/s, having recently come no closer than 54.47 pc ly 0 flip out on off. Gray (1989) as well as Houk and Swift (1999) have this star classified as an F-type main-sequence star with a stellar classification of F5 V. However, in the 5th revised edition of the Bright Star Catalogue it was classed by Hoffleit and Warren (1991) as a more evolved subgiant star with a class of F5 IV. The absolute magnitude and effective temperature for this star shows that it is entering the Hertzsprung gap, which is occupied by a class of stars that have consumed the hydrogen at their core but have not yet begun hydrogen fusion along a shell surrounding the center. Evolutionary models for this star give an estimated age of around 2.1 billion years with 1.6 times the mass of the Sun. It has 2.6 times the Sun's radius and is radiating 10.7 times the Sun's luminosity from its photosphere at an effective temperature of about 6,583 K. There is a thin convective envelope near its surface. The star has a lower abundance of elements more massive than helium – what astronomers' term the metallicity – compared to the Sun. The projected rotational velocity is a relatively low 5 km/s, but the rotation rate is unknown since the axial tilt hasn't been determined. 14 Ceti shows an X-ray emission of 0.33 30 erg s−1, which is on the high side for an F5 star. Both the corona and chromosphere of this star show indications of a magnetic field, and a surface field was detected in 2009 with a strength of −30 G. This made it the only known star between classes F0 and F7 to have a Zeeman effect detected. Two possible explanations for this field are that it is a fast rotator with a dynamo-driven field, or that it is a former Ap star. The activity properties of this star make it more likely to be the latter. References 14 Cet December 20, 2018 2542768012447142784 Gontcharov G. A. Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system Astronomy Letters 32 11 759–771 November 2006 10.1134/S1063773706110065 2006AstL...32..759G 1606.08053 119231169. Descendants of magnetic and non-magnetic A-type stars Aurière M. Lignières F. Konstantinova-Antova R. Charbonnel C. Petit P. Tsvetkova S. Wade G. 1 Putting A Stars into Context: Evolution, Environment, and Related Stars, Proceedings of the international conference held on June 3-7, 2013 at Moscow M.V. Lomonosov State University in Moscow, Russia G. Mathys E. Griffin O. Kochukhov R. Monier G. Wahlgren Moscow Pero 444–450 November 2014 2014psce.conf..444A 1310.6942. R. O. Gray The extension of the MK spectral classification system to the intermediate population II F type stars Astronomical Journal 98 3 1049–1062 1989 1989AJ.....98.1049G 10.1086/115195 . Michigan catalogue of two-dimensional spectral types for the HD Stars Houk N. Swift C. Michigan Spectral Survey Ann Arbor, Michigan Department of Astronomy, University of Michigan 5 1999 1999MSS...C05....0H . 1 Bensby T. Feltzing S. Oey M. S. Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the solar neighbourhood Astronomy & Astrophysics 562 A71 28 2014 10.1051/0004-6361/201322631 2014A&A...562A..71B 1309.2631 118786105. The magnetic fields at the surface of active single G-K giants Aurière M. Konstantinova-Antova R. Charbonnel C. Wade G. A. Tsvetkova S. Petit P. Dintrans B. Drake N. A. Decressin T. Lagarde N. Donati J.-F. Roudier T. Lignières F. Schröder K.-P. Landstreet J. D. Lèbre A. Weiss W. W. Zahn J.-P. 1 Astronomy & Astrophysics 574 A90 30 February 2015 10.1051/0004-6361/201424579 2015A&A...574A..90A 1411.6230 118504829 . Holmberg J. Nordstrom B. Andersen J. 1 The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics Astronomy and Astrophysics 501 3 July 2009 941–947 10.1051/0004-6361/200811191 2009A&A...501..941H 0811.3982 118577511 . Bright Star Catalogue 5th Revised Hoffleit D. Warren W. H. Jr. VizieR Online Data Catalog November 1995 1995yCat.5050....0H . 14 Ceti: a probable Ap-star-descendant entering the Hertzsprung gap Aurière M. Konstantinova-Antova R. Petit P. Charbonnel C. Van Eck S. Donati J. -F. Lignières F. Roudier T. 1 Astronomy & Astrophysics 543 A118 6 July 2012 10.1051/0004-6361/201219324 2012A&A...543A.118A 1205.6962 118482901. XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644. Category:F5V stars Category:F-type subgiants Category:Hertzsprung gap Category:Cetus (constellation) 0143 Category:Durchmusterung objects 003229 002787