Astronomy:HD 101782

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Short description: High proper motion star; K-type giant
HD 101782
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 101782 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Chamaeleon
Right ascension  11h 41m 01.30826s[1]
Declination −83° 05′ 59.7773″[1]
Apparent magnitude (V) 6.33±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K0 III[4]
U−B color index +0.88[5]
B−V color index +1.08[5]
Astrometry
Radial velocity (Rv)11.5±0.4[6] km/s
Proper motion (μ) RA: −59.825[1] mas/yr
Dec.: +9.477[1] mas/yr
Parallax (π)9.1605 ± 0.0172[1] mas
Distance356.0 ± 0.7 ly
(109.2 ± 0.2 pc)
Absolute magnitude (MV)+1.11[7]
Details
Mass2±0.5[8] M☉
Radius10.1[9] R☉
Luminosity55.25±0.21[1] L☉
Surface gravity (log g)2.73[1] cgs
Temperature4,663±127[10] K
Metallicity [Fe/H]+0.04[11] dex
Rotational velocity (v sin i)<1.1[12] km/s
Age455[1] Myr
Other designations
CD−82°224, CPD−82°469, GC 16057, HD 101782, HIP 56996, HR 4507, SAO 258621, WDS J11410-8306A[13]
Database references
SIMBADdata

HD 101782, also known as HR 4507, is a yellowish-orange hued star located in the southern circumpolar constellation of Chamaeleon. It has an apparent magnitude of 6.33,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 356 light years away from the Solar System.[1] It appears to be receding with a heliocentric radial velocity of 11.5 km/s.[6] De Mederios found the radial velocity to be variable, suggesting that it may be a spectroscopic binary.[12] Eggen (1989) lists it as a member of the young disk population.[11]

HD 101782 has a stellar classification of K0 III,[4] indicating that it is an evolved red giant. It is currently on the horizontal branch (HB), fusing helium at its core.[3] The star is located on the cool end of the red clump, a region on the HR diagram with metal-rich HB stars. It has double the mass of the Sun[8] but has expanded to 10.1 times its girth.[9] It radiates 55 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,663 K.[10] It has an iron abundance 110% that of the Sun's, placing it at solar metallicity.[11] Like most giants it spins slowly, having a projected rotational velocity lower than 1.1 km/s.[12]

TYC 9507-3649-1 is a 10th magnitude optical companion located 25.9″ away along a position angle of 139°.[14] This companion was first noticed by Sir John Herschel in 1837.[15]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society 419 (2): 1637–1641. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711. Bibcode: 2012MNRAS.419.1637L. 
  4. ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H. 
  5. ↑ 5.0 5.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  9. ↑ 9.0 9.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal 158 (2): 93. doi:10.3847/1538-3881/ab3048. Bibcode: 2019AJ....158...93B. 
  11. ↑ 11.0 11.1 11.2 Eggen, Olin J. (January 1989). "Large and Kinematically Unbiased Samples of G- and K-Type Stars. III. Evolved Young Disk Stars in the Bright Star Sample". Publications of the Astronomical Society of the Pacific 101: 54. doi:10.1086/132404. ISSN 0004-6280. Bibcode: 1989PASP..101...54E. 
  12. ↑ 12.0 12.1 12.2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  13. ↑ "HD 101782". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+101782. 
  14. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  15. ↑ Herschel, J. F. W. (1835). "A Second Series of Micrometrical Measures of Double Stars chiefly performed with the 7-feet Equatorial, at Slough, in the years 1831, 1832, and 1833". Memoirs of the Royal Astronomical Society 8: 37. Bibcode: 1835MmRAS...8...37H. 
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