36 Ophiuchus ( lat. 36 Ophiuchi ) is a triple star in the constellation Ophiuchus . It is located at a distance of about 19.5 light years from the Sun.
| 36 Ophiuchus ABC | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 19.5 ± 0.1 St. years (5.97 ± 0.04 pc ) | ||
| Visible magnitude ( V ) | A: 5.29 B: 5.33 C: 6.34 | ||
| Constellation | Ophiuchus | ||
| Astrometry | |||
| Radial velocity ( R v ) | -0.6 / 0.0 / -1.6 km / s | ||
| Own movement (μ) | RA: -473.70 mas per year Dec: -1143.93 mas per year | ||
| Parallax (π) | 167.08 ± 1.07 mas | ||
| Characteristics | |||
| Spectral class | A: K0V In: K1V C: K5V | ||
| Color Index ( B - V ) | 0.86 (AB) / 1.15 | ||
| Color Index ( U - B ) | 0.51 (AB) / 1.04 | ||
| Variability | RS CV | ||
| physical characteristics | |||
| Weight | 0.85 / 0.85 / 0.71 M ☉ | ||
| Radius | 0.81 / 0.81 / 0.72 R ☉ | ||
| Age | 1.43⋅10 9 (AB) /0.6⋅10 9 years | ||
| Temperature | 5125/5100/4550 K | ||
| Luminosity | 0.28 / 0.27 / 0.09 L ☉ | ||
| Metallicity | A: 50-98% B: 120-250% C: 46-100% | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
- 1 Features
- 1.1 36 Ophiuchus A
- 1.2 36 Ophiuchus B
- 1.3 36 Ophiuchus C
- 2 Nearest star surroundings
- 3 In fiction
- 4 notes
- 5 See also
- 6 References
Features
System 36 Ophiuchus consists of a close pair of stars A and B , divided by an average distance of 88 a. e .; they revolve around a common center of mass in a very elongated orbit (e = 0.922) with an apoaster of 169 a. E. and periastrome 7 a. e. They complete a full turn in 570 years . [3] Star C revolves around this pair at a distance of 4370 to 5390 a. e. All three stars are relatively young by astronomical standards: the age of the AB component is about 1.43 billion years, and the C component is 590 ± 70 million years. [four]
36 Ophiuchus A
The main component belongs to the class of orange dwarfs of the main sequence and has a mass and diameter of 85% and 81% solar, respectively. [5] Its luminosity does not exceed 28% of the solar. The surface temperature of the star is estimated at 5125 degrees Kelvin .
36 Ophiuchus B
Component B is also an orange dwarf with similar parameters: mass and diameter are 85% and 81% of solar, respectively, and luminosity does not exceed 27% of solar luminosity [5] . The detected radial velocity fluctuations indicate the possible presence of a massive sub-stellar object orbiting component B. Calculations show that this should be an object with a mass of about 8 Jupiter masses. However, the approach of components A and B to a distance of 6.8 a. e. indicate the impossibility of the existence of any objects weighing more than 2 Jupiter masses in the orbit of this component: such a supermassive planet would simply be torn to pieces by powerful gravitational fields of both stars. Most likely, fluctuations in radial velocity are caused by the chromospheric activity of the star [3] .
36 Ophiuchus C
The third component in its characteristics is similar to the other two stars in the system. This is a dull orange dwarf of the main sequence with a mass of 71% and a diameter of 72% of the solar [5] . The luminosity of the star is only 8.7% of the solar. Jiada Arnie of the Goddard Space Flight Center (NASA), who studied the orange spectral class K dwarfs, considers the stars HD 156026 (36 Ophiuchus C), 61 Swans AB, Epsilon Indian and Grumbridge 1618 to be excellent targets for future searches for biosignatures , as the oxygen-methane biomarker more pronounced in orbit in orange dwarfs than in yellow dwarfs like the Sun [6] .
Nearest star environment
The following star systems are located within 10 light years of 36 Ophiuchus:
| Star | Spectral class | Distance, st. years |
| CD-32 1329 | M2 V | 3.0 |
| Gliese 667 ABC | K3-4 V / K5 V / M2.5 V | 4,5 |
| Wolf 630 ABC | M2.5 Ve / M4.5 Ve / M7 V | 6.3 |
| CD-44 11909 | M3.5-5 V | 6.4 |
| Wolf 629 AB | M3.5 V /? | 6.8 |
| BD-12 4523 AB | M3.0 V /? | 7.5 |
| Gliese 674 | M2.5-3 V | 7.6 |
| G 154-44 | M4.5 V | 8.2 |
| CD-40 9712 | M0-3 V | 8.6 |
In Fiction
- Dune and other novels about the Dune universe created by Frank Herbert put the planet Gyedi Prime , the metropolis of House Harkonnen , in the orbit of one of the components, 36 Ophiuchus B. [7]
- In the computer games Frontier: Elite 2 and Frontier: First Encounters , the 36 Ophiuchus system [8] specializes in mining; the population of the system is centered around the first moon 36 Ophiuchus C.
Notes
- ↑ 1 2 3 4 Leeuwen F. v. Validation of the new Hipparcos reduction // Astron. Astrophys. - EDP Sciences , 2007. - Vol. 474, Iss. 2. - P. 653–664. - ISSN 0004-6361 ; 0365-0138 ; 1432-0746 ; 1286-4846 - doi: 10.1051 / 0004-6361: 20078357 - arXiv: 0708.1752
- ↑ SIMBAD . - 36 Ophiuchus ABC in the SIMBAD database . Date of appeal September 21, 2009.
- ↑ 1 2 Irwin, AW, Yang, SLS, & Walker, GAH 36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities . Publications of the Astronomical Society of the Pacific, v. 108, p. 588 (1996). Date of treatment September 21, 2009. Archived on April 7, 2012.
- ↑ Sydney A. Barnes. Ages for illustrative field stars using gyrochronology: viability, limitations and errors . Arxiv.org (23 Apr 2007). Date of appeal September 21, 2009.
- ↑ 1 2 3 Johnson, HM & Wright, CD redicted infrared brightness of stars within 25 parsecs of the sun . Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 53, Nov. 1983, p. 643-711. (Nov. 1983). Date of treatment September 21, 2009. Archived February 16, 2012.
- ↑ Giada N. Arney . The K Dwarf Advantage for Biosignatures on Directly Imaged Exoplanets , 2019 March 6
- ↑ Frank Herbert . Dune . - Chilton Books , 1965. - P. xiv. - 412 p. - ISBN 0-8019-5077-5 , ISBN 978-0-8019-5077-3 . .
- ↑ Frontier Star Systems . FrontierAstro (August 19, 2008). Date of treatment May 5, 2009. Archived on April 7, 2012.
See also
- Ophiuchus constellation star list