40 Cancri
In today's article we are going to delve into the fascinating world of 40 Cancri. From its origins to its evolution today, this topic has aroused unprecedented interest in numerous people around the world. We will explore the different aspects that make 40 Cancri so relevant in today's society and how it has impacted various areas of daily life. In addition, we will analyze the different perspectives and opinions of experts on the subject, with the aim of providing a more complete and enriching vision for our readers. Get ready to embark on a fascinating journey through 40 Cancri!
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 40m 11.45280s[1] |
| Declination | +19° 58′ 16.0852″[1] |
| Apparent magnitude (V) | 6.61[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1 V[3] |
| B−V color index | 0.006±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +34.4±0.6[2] km/s |
| Proper motion (μ) | RA: −35.312[1] mas/yr Dec.: −13.595[1] mas/yr |
| Parallax (π) | 5.2065±0.0713 mas[1] |
| Distance | 626 ± 9 ly (192 ± 3 pc) |
| Absolute magnitude (MV) | 0.32[2] |
| Details | |
| Mass | 2.46±0.12[4] M☉ |
| Radius | 2.72±0.12[4] R☉ |
| Luminosity | 73.68[2] L☉ |
| Surface gravity (log g) | 3.78[5] cgs |
| Temperature | 9,382[5] K |
| Rotational velocity (v sin i) | 10[5] km/s |
| Other designations | |
| 40 Cnc, BD+20°2159, HD 73666, HIP 42523, SAO 80336, WDS J08401+2000[6] | |
| Database references | |
| SIMBAD | data |
40 Cancri is a binary star[4] system in the zodiac constellation of Cancer, located about 614[1] light years from the Sun in the Beehive Cluster (NGC 2632).[4] It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.61.[2] The system is moving further from the Earth with a heliocentric radial velocity of 34 km/s.[2]
The primary component appears to be a normal A-type main-sequence star with a stellar classification of A1 V,[3] showing neither an organized magnetic field nor a chemical peculiarity.[5] However, it has an excessive temperature for its luminosity, and thus is considered an extreme[4] blue straggler.[7] This is a second generation star formed through a collision of two low mass stars some 5–350 million years ago. The collision was either between two separate cluster members or the coalescence of a binary star system.[4]
With an effective temperature of 9,382[5] K, this is the hottest star in the cluster[7] by about 1,200 K. It has 2.46 times the mass of the Sun and 2.72 times the Sun's radius. The star has an unusually slow rotation for an A1V star,[4] with a projected rotational velocity of 10 km/s.[5] It is radiating 74[2] times the Sun's luminosity from its photosphere.
40 Cancri has a common proper motion companion, located at an angular separation of 0.425″±0.009″ along a position angle of 127.6°±0.5°, as of 1983. This object is about 2.5±0.5 magnitudes dimmer than the primary, and is most likely an F-type star with a mass of about 1.5 M☉. The projected separation between the pair is 80 AU, so their orbital period is 450 years or greater.[4]
References
- ^ a b c d e f 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.
- ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Bidelman, William P. (August 1956), "Spectral Classification of the Brighter Stars of the Praesepe Cluster", Publications of the Astronomical Society of the Pacific, 68 (403): 318, Bibcode:1956PASP...68..318B, doi:10.1086/126944.
- ^ a b c d e f g h Fossati, L.; et al. (January 2010), "Explaining the Praesepe blue straggler HD 73666", Astronomy and Astrophysics, 510: A8, arXiv:0911.1874, Bibcode:2010A&A...510A...8F, doi:10.1051/0004-6361/200811495, S2CID 118658470, A8.
- ^ a b c d e f Fossati, L.; et al. (December 2007), "Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster", Astronomy and Astrophysics, 476 (2): 911–925, arXiv:0710.0579, Bibcode:2007A&A...476..911F, doi:10.1051/0004-6361:20078320, S2CID 16152096.
- ^ "40 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-03.
- ^ a b Andrievsky, Sergei. M. (June 1998), "Blue stragglers in open clusters. I. NGC 2632", Astronomy and Astrophysics, 334: 139−145, Bibcode:1998A&A...334..139A.
