Chi Tauri
Template:Short description Script error: No such module "about".
Template:Location mark Location of χ Tauri (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| χ Tau A | |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.378[2] |
| χ Tau B | |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 8.423[4] |
| Characteristics | |
| χ Tau A | |
| Spectral type | B9V[4] |
| U−B Template:Engvar | -0.12[5] |
| B−V Template:Engvar | -0.04[5] |
| χ Tau B | |
| Spectral type | F8 + G6 + K4 + K4[4] |
| U−B Template:Engvar | +0.10[5] |
| B−V Template:Engvar | +0.63[5] |
| Astrometry | |
| χ Tau A | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: +20.953[1] mas/yr Dec.: −16.495[1] mas/yr |
| Parallax (π) | 11.0472±0.1599 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[4] |
| χ Tau B | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: 15.766[3] mas/yr Dec.: −20.396[3] mas/yr |
| Parallax (π) | 11.5348±0.0857 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Combined: Script error: No such module "val". Ba: Script error: No such module "val". Bb: Script error: No such module "val". Bc: 7.87 / 7.87[4] |
| Orbit[4] | |
| Primary | χ Tau Ba |
| Companion | χ Tau Bb |
| Period (P) | 17.602309 ± 0.000036 d |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Orbit[4] | |
| Primary | χ Tau Bab |
| Companion | χ Tau Bc |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details | |
| Age | Script error: No such module "val".[4] Myr |
| χ Tau A | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | 2.15[6] Template:Solar radius |
| Surface gravity (log g) | 4.15 ± 0.14[7] cgs |
| Temperature | Script error: No such module "val".[4] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | 263[7] km/s |
| χ Tau Ba | |
| Mass | 1.19[4] Template:Solar mass |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | Script error: No such module "val".[4] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[4] km/s |
| χ Tau Bb | |
| Mass | 1.02[4] Template:Solar mass |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | Script error: No such module "val".[4] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[4] km/s |
| χ Tau Bc | |
| Mass | ~0.70 / 0.70[4] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | χ Tau A |
| χ Tau B | |
Script error: No such module "Check for unknown parameters".
Chi Tauri, Latinised from χ Tauri, is a star system in the constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about Script error: No such module "convert". from Earth. The primary component has an apparent magnitude of about 5.4,[2] meaning it is visible with the naked eye.
The main component of the system is Chi Tauri A. It is a B-type main-sequence star. Its mass is 2.6 times that of the Sun and its surface glows with an effective temperature of Script error: No such module "val".. It may be a binary star itself, as suggested from astrometric data from Hipparcos, although no orbit could be derived.[4]
The secondary component of the system is Chi Tauri B, separated about 19″[4] from Chi Tauri A. It was thought to be a post-T Tauri star from its unusual spectrum,[8] but later studies ruled this out.[4] It is a double-lined spectroscopic binary—the two stars are not resolved but their spectra have periodic Doppler shifts indicating orbital motion. The two stars are an F-type star and a G-type star, respectively, and are designated Ba and Bb.[4]
The radial velocity of Chi Tauri B has a slow drift indicating the presence of another star in the system. Designated Chi Tauri Bc, this massive object is too dim to be detected, but it appears in Chi Tauri B's spectrum as an infrared excess. Because of this infrared excess, this unseen component is thought to be a pair of K-type main-sequence stars both with masses 70% of the Sun's. The stars within the system appear to be dynamically interacting.[4]
Naming
- With φ, κ1, κ2 and υ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs.[9] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars: φ as Alkalbain I, this star (χ) as Alkalbain II, κ1 as Alkalbain III, κ2 as Alkalbain IV and υ as Alkalbain V.[10]Script error: No such module "Unsubst".
- In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Whetstone, refers to an asterism consisting of χ Tauri, ψ Tauri, 44 Tauri and φ Tauri. Consequently, the Chinese name for χ Tauri itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[11]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e Template:Cite DR2
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d e Template:Cite DR2
- ↑ a b c d e f g h i j k l m n o p q r s t u v w x y z Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".