Misplaced Pages

HD 155448

Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Quintuple star system in the constellation Scorpius
HD 155448
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 17 12 58.7680
Declination −32° 14′ 33.5690″
Apparent magnitude (V) 8.72
Characteristics
HD 155448 A
Evolutionary stage Main sequence
Spectral type B1 V
B−V color index −0.27±0.02
HD 155448Ba
Evolutionary stage main sequence star
Spectral type B6V
B−V color index −0.15±0.02
HD 155448 Bb
Evolutionary stage main sequence star
Spectral type B9V
B−V color index −0.08±0.02
HD 155448 C
Evolutionary stage Main sequence
Spectral type B4 Ve
B−V color index −0.19±0.02
HD 155448 D
Evolutionary stage Main sequence
Spectral type B8 V
B−V color index −0.11±0.02
Astrometry
A
Proper motion (μ) RA: +2.551 mas/yr
Dec.: –1.666 mas/yr
Parallax (π)0.9566 ± 0.0440 mas
Distance3,400 ± 200 ly
(1,050 ± 50 pc)
B
Proper motion (μ) RA: +1.758 mas/yr
Dec.: –1.520 mas/yr
Parallax (π)0.8401 ± 0.0384 mas
Distance3,900 ± 200 ly
(1,190 ± 50 pc)
D
Proper motion (μ) RA: +2.491 mas/yr
Dec.: –1.567 mas/yr
Parallax (π)0.7837 ± 0.0263 mas
Distance4,200 ± 100 ly
(1,280 ± 40 pc)
Details
A
Mass>7 M☉
Surface gravity (log g)4 cgs
Temperature25,000 K
Rotational velocity (v sin i)90±5 km/s
Ba
Mass5 M☉
Surface gravity (log g)4 cgs
Temperature14,000 K
Rotational velocity (v sin i)150±50 km/s
Bb
Mass3 M☉
Surface gravity (log g)4 cgs
Temperature10,000 K
Rotational velocity (v sin i)150±50 km/s
C
Mass6 M☉
Surface gravity (log g)4 cgs
Temperature16,000 K
Rotational velocity (v sin i)50±10 km/s
D
Mass3.5 M☉
Surface gravity (log g)4 cgs
Temperature12,000 K
Rotational velocity (v sin i)300±15 km/s
Other designations
CD–32°12461, HD 155448, HIP 84228, SAO 208540, WDS J17130-3215
Database references
SIMBADdata

HD 155448 is a quintuple star system consisting of 5 young B-type stars . With an apparent magnitude of 8.72, it is too dim to be visible with the naked eye.

Parallax measurements from the Hipparcos spacecraft in 1997 give the system a distance of 1,976 light years with a margin of error larger than the parallax itself. The New Hipparcos Reduction gives a distance of 6,272 light years, but still with a statistical margin of error larger than the parallax value. Gaia parallaxes are available for the visible components. For component C, the Gaia Data Release 2 and Gaia Early Data Release 3 (EDR3) parallaxes are both negative and somewhat meaningless. For components A, B, and D, the Gaia EDR3 parallaxes are 0.9566±0.0440 mas, 0.8401±0.0384 mas, and 0.7837±0.0263 mas respectively, implying a distance around 4,000 light years.

Before 2011, this star was mistaken as either a Herbig Ae/Be star or a post-AGB object. When the system was studied in 2011, it was originally believed to contain only 4 stars (or at least more than 2 stars). In 2011, a study conducted at the European Southern Observatory in Chile concluded that the "B" star is actually a binary star, thus reclassifying it as a quintuple star system. HD 155448 A, B, C, and D. Periods have been estimated at 27,000 years for Bab, 59,000 years for AB, 111,000 years for Ac, and 327,000 years for AD. However, analysis in 2011 states that the stars are not gravitationally bound to each other.

All of the stars are currently on the ZAMS. At present the primary star has a mass greater than 7 solar masses and an effective temperature of 25,000 K, while the companions have masses ranging from 3-6 times the mass of the Sun, and temperatures ranging from 10,000-16,000 K.

References

  1. ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (1997-07-01). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49 – L52. Bibcode:1997A&A...323L..49P. ISSN 0004-6361.
  2. ^ "HD 155448". sim-basic. Retrieved 21 March 2021.
  3. ^ Schütz, O.; Meeus, G.; Carmona, A.; Juhász, A.; Sterzik, M. F. (2011-09-01). "The young B-star quintuple system HD 155448". Astronomy and Astrophysics. 533: A54. arXiv:1108.1557. Bibcode:2011A&A...533A..54S. doi:10.1051/0004-6361/201016396. ISSN 0004-6361.
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. ISSN 1432-0746.
  8. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. Vioque, M.; Oudmaijer, R. D.; Baines, D.; Mendigutía, I.; Pérez-Martínez, R. (December 2018). "Gaia DR2 study of Herbig Ae/Be stars". Astronomy & Astrophysics. 620: A128. arXiv:1808.00476. Bibcode:2018A&A...620A.128V. doi:10.1051/0004-6361/201832870. ISSN 1432-0746.
  10. Luna, R.; Cox, N. L. J.; Satorre, M. A.; García Hernández, D. A.; Suárez, O.; García Lario, P. (March 2008). "A search for diffuse bands in the circumstellar envelopes of post-AGB stars". Astronomy & Astrophysics. 480 (1): 133–148. arXiv:0711.1843. Bibcode:2008A&A...480..133L. doi:10.1051/0004-6361:20065282. ISSN 1432-0746.
  11. Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.
Constellation of Scorpius
Stars
Bayer
Flamsteed
Variable
HR
HD
Other
Exoplanets
Star
clusters
NGC
Other
Nebulae
NGC
Galaxies
NGC
Other
Category
Categories:
HD 155448 Add topic