Astronomy:HD 73752

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Short description: Triple star system in the constellation Pyxis
HD 73752
Location of HD 73752 (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pyxis
Right ascension  08h 39m 17.89867s
Declination −22° 39′ 42.8283″
Apparent magnitude (V) 5.17 (combined)[2]
Characteristics
Spectral type (G5IV + unknown) + K0V or GV[3]
B−V color index 0.83[2]
J−H color index 0.456[4]
J−K color index 0.461[4]
Astrometry
Radial velocity (Rv)52.13 ± 0.22[5] km/s
Proper motion (μ) RA: −240.319[1] mas/yr
Dec.: 459.973[1] mas/yr
Parallax (π)50.9663 ± 0.3068[1] mas
Distance64.0 ± 0.4 ly
(19.6 ± 0.1 pc)
Absolute magnitude (MV)3.83 (A), 5.28 (B)[6]
Orbit[3]
PrimaryHD 73752 Aa
CompanionHD 73752 Ab
Period (P)211.76±0.17 d
Semi-major axis (a)≥(8.83±0.16)×106 km
Eccentricity (e)0.210±0.016
Periastron epoch (T)56372.6±2.7
Argument of periastron (ω)
(secondary)		142.9±4.9°
Orbit[7]
PrimaryHD 73752 A
CompanionHD 73752 B
Period (P)127 yr
Semi-major axis (a)1.69"
(34 astronomical unit|AU[8])
Eccentricity (e)0.32
Inclination (i)167°
Longitude of the node (Ω)211°
Periastron epoch (T)1986
Argument of periastron (ω)
(secondary)		124°
Details[6]
HD 73752 Aa
Mass1.21 M☉
Radius1.68 R☉
Luminosity2.31[lower-alpha 1] L☉
Surface gravity (log g)4.07 cgs
Temperature5680 K
Metallicity [Fe/H]0.32 dex
Rotational velocity (v sin i)3.3±0.5[9] km/s
Age7 Gyr
HD 73752 B
Mass1.04 M☉
Radius1.01 R☉
Luminosity0.608[lower-alpha 1] L☉
Surface gravity (log g)4.45 cgs
Temperature5340 K
Other designations
BD−22°2345, CD−22°6442, Gaia DR2 5702029063555481088, GC 11877, GJ 314, HD 73752, HIP 42430, HR 3430, SAO 176226, PPM 254900, WDS J08391-2240AB, LTT 3202, 2MASS J08390794-2239427, WISE J083907.75-223936.6, ADS 6914 AB[10]
Database references
SIMBADThe system
A
B

HD 73752 is a multiple star system located in the southern constellation of Pyxis. With an apparent magnitude of 5.17, it can be faintly seen by the naked eye from Earth as a yellow-hued dot of light. As such, it is listed in the Bright Star Catalogue as HR 3430. It is located at a distance of approximately 64.0 light-years (19.6 parsecs) according to Gaia EDR3 parallax measurements, and is receding at a heliocentric radial velocity of 52.13 km/s.

Physical properties

The system is roughly seven billion years old, much older than the Solar System (4.568 Gyr[11]), and belongs to the thin disk population of the Milky Way.[6]

The primary star, HD 73752 Aa, is an aging subgiant, a star that has fused all the hydrogen in its core into helium and evolved past the main sequence, with the spectral type G5IV. It is 21% more massive than the Sun, equivalent to a typical F-type main-sequence star with the spectral type F7V,[12] but has expanded to a radius of 1.68 R☉. It radiates 2.31 times the luminosity of the Sun from its photosphere at an effective temperature of 5,680 K (5,410 °C; 9,760 °F). The entire system is very metal-rich with a metallicity of +0.32, which equates to an iron abundance 100.32 ≈ 2.1 times that of the Sun. A low-mass close companion, Ab, orbits Aa in a 211.76-day (0.5798-year) orbit, but its precise parameters remain uncertain.[3]

The secondary star, which is in a 127-year binary orbit with the Aa/Ab pair, is a G-type or K-type main-sequence star similar to the Sun in mass and radius, but substantially cooler at 5,340 K (5,070 °C; 9,150 °F). As such, it emits only three-fifths the Sun's luminosity.

Multiplicity

HD 73752 has been known to be a close visual binary since 1874.[3] As early as 1943, a third unseen component was suspected, though this suggestion of a ~0.1 M☉ object in a 35-year orbit remained inconclusive,[6] and a 1967 study[13] turned up little evidence. Radial velocity variations were observed in 1980[14] and 2006[15] that strongly implied a low-mass object, though the orbital parameters could not be obtained. In 2016, HD 73752 A was finally confirmed to be a spectroscopic binary.[3]

Additionally, another possible companion, 13.7 magnitudes fainter than the primary in the H band, was noticed at a separation of 4".50 in right ascension and 6".02 in declination, but this has not been followed up on.[16]

Circumstellar disc

HD 73752 has been referred to as a "Vega-like star," a star that exhibits excess infrared emission due to an optically thin dusty circumstellar disc containing almost no gas. Because this star is past the main sequence, the process in which the emissions are produced may diverge from that of younger such stars e.g., Epsilon Eridani, HD 53143, HD 69830, and HD 98800.[17] In 2012, a debris disc was detected at a distance of 21 AU from the primary, an unstable position close to the secondary star's orbit at 34 AU.[8] Despite this, a 2019 study did not find any significant infrared excess at a wavelength of 70 μm.[18]

See also

Notes

  1. ↑ 1.0 1.1 Calculated from absolute magnitude.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Zacharias, N. et al. (2013-01-14). "The Fourth Us Naval Observatory CCD Astrograph Catalog (Ucac4)". The Astronomical Journal 145 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Willmarth, Daryl W. et al. (2016-08-01). "Spectroscopic Orbits for 15 Late-Type Stars". The Astronomical Journal 152 (2): 46. doi:10.3847/0004-6256/152/2/46. ISSN 0004-6256. Bibcode: 2016AJ....152...46W. 
  4. ↑ 4.0 4.1 Cutri, Roc M. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. 
  5. ↑ Maldonado, J. et al. (2010). "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups". Astronomy and Astrophysics 521: A12. doi:10.1051/0004-6361/201014948. ISSN 0004-6361. Bibcode: 2010A&A...521A..12M. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Fuhrmann, K. et al. (2011-03-11). "BESO échelle spectroscopy of solar-type stars at Cerro Armazones: BESO échelle spectroscopy". Monthly Notices of the Royal Astronomical Society 411 (4): 2311–2318. doi:10.1111/j.1365-2966.2010.17850.x. https://academic.oup.com/mnras/article-pdf/411/4/2311/3047619/mnras0411-2311.pdf. Retrieved 2024-12-24. 
  7. ↑ Söderhjelm, Staffan (January 1999). "Visual Binary Orbits and Masses Post-Hipparcos". Astronomy & Astrophysics 341: 121–140. Bibcode: 1999A&A...341..121S. 
  8. ↑ 8.0 8.1 Rodriguez, David R. et al. (2012-02-01). "Binaries Among Debris Disk Stars". The Astrophysical Journal 745 (2): 147. doi:10.1088/0004-637X/745/2/147. ISSN 0004-637X. Bibcode: 2012ApJ...745..147R. 
  9. ↑ Weise, P. et al. (2010). "Rotational velocities of nearby young stars". Astronomy and Astrophysics 517: A88. doi:10.1051/0004-6361/201014453. ISSN 0004-6361. Bibcode: 2010A&A...517A..88W. https://www.aanda.org/articles/aa/pdf/2010/09/aa14453-10.pdf. Retrieved 2024-12-24. 
  10. ↑ "HD 73752". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+73752. 
  11. ↑ Bouvier, A.; Wadhwa, M. (2010). "The age of the Solar System redefined by the oldest Pb–Pb age of a meteoritic inclusion". Nature Geoscience 3 (9): 637–641. doi:10.1038/NGEO941. Bibcode: 2010NatGe...3..637B. 
  12. ↑ Mamajek, Eric (2022-04-16). "A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence". http://www.pas.rochester.edu/~emamajek/EEM_dwarf_UBVIJHK_colors_Teff.txt. 
  13. ↑ Newburg, J. L. (1967). "The Orbit of β 208 AB, ADS 6914, HD 73752, with Some Notes on the System". Monthly Notes of the Astronomical Society of Southern Africa 26: 110–113. Bibcode: 1967MNSSA..26..110N. 
  14. ↑ Abt, H. A.; Levy, S. G.; Sanwal, N. B. (1980). "Visual multiples. V - Radial velocities of 160 systems". The Astrophysical Journal Supplement Series 43: 549. doi:10.1086/190682. ISSN 0067-0049. Bibcode: 1980ApJS...43..549A. 
  15. ↑ Abt, Helmut A. et al. (2006). "The Secondaries of Solar-Type Primaries. I. The Radial Velocities". The Astrophysical Journal Supplement Series 162 (1): 207–226. doi:10.1086/498095. ISSN 0067-0049. Bibcode: 2006ApJS..162..207A. 
  16. ↑ Janson, Markus et al. (2013-07-26). "The Seeds Direct Imaging Survey for Planets and Scattered Dust Emission in Debris Disk Systems". The Astrophysical Journal 773 (1): 73. doi:10.1088/0004-637X/773/1/73. ISSN 0004-637X. Bibcode: 2013ApJ...773...73J. 
  17. ↑ Song, Inseok et al. (2000-04-10). "Ages of Late Spectral Type Vega-like Stars". The Astrophysical Journal 533 (1): L41–L44. doi:10.1086/312597. PMID 10727387. Bibcode: 2000ApJ...533L..41S. 
  18. ↑ Yelverton, Ben et al. (2019-09-21). "A statistically significant lack of debris discs in medium separation binary systems". Monthly Notices of the Royal Astronomical Society 488 (3): 3588–3606. doi:10.1093/mnras/stz1927. ISSN 0035-8711. 



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