4U 1700-37
File:V884ScoLightCurve.png A light curve for V884 Scorpii. The main plot, from TESS data,[1] shows the variation over several orbital periods. The inset plot, adapted from van Paradijs et al. (1984),[2] shows the average variation as a function of orbit phase. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 6.51 (- 6.57) - 6.60[4] |
| Characteristics | |
| Spectral type | O6Iafcp[5] |
| U−B Template:Engvar | −0.727[6] |
| B−V Template:Engvar | +0.253[6] |
| Variable type | Ellipsoidal + HMXB[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: 2.414[3] mas/yr Dec.: 5.022[3] mas/yr |
| Parallax (π) | 0.6327±0.0259 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −6.52[8] |
| Orbit[9] | |
| Period (P) | 3.4118 ± 0.0001 d |
| Eccentricity (e) | Script error: No such module "val". |
| Periastron epoch (T) | JD Script error: No such module "val". |
| Argument of periastron (ω) (primary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | 10.06 ± 0.66 km/s |
| Details[10] | |
| O star | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 660,000 Template:Solar luminosity |
| Temperature | Script error: No such module "val". K |
| X-ray object | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[11] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
4U 1700-37 is one of the stronger binary X-ray sources in the sky, and is classified as a high-mass X-ray binary. It was discovered by the Uhuru satellite.[12] The "4U" designation refers to the fourth (and final) Uhuru catalog.
The X-ray source is associated with a bright (6.53 V magnitude) blue supergiant star HD 153919, which is orbited by an accreting compact object that must be either a neutron star or a black hole. The X-ray source is eclipsed by the star every 3.4 days, but no pulsations have yet been observed. The source is one of the ten brightest persistent X-ray sources in the 10-100 keV hard X-ray energy region.
Evidence of Compton cooling during an X-ray flare recorded by the Chandra X-ray telescope strongly suggests that the compact object is a neutron star;[13] if verified it would be among the most massive known, and near the boundary of the theoretical maximum.
4U 1700-37 is a runaway system. It has a high velocity of Script error: No such module "val". with respect to its parent cluster, NGC 6231. It was kicked out of the cluster about 2.2 million years ago by a supernova explosion.[14]
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c d e Template:Cite Gaia EDR3
- ↑ a b 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".
- ↑ Template:Cite simbad
- ↑ 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".
External links
- 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".