Astronomy:HD 171034
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius[1] |
| Right ascension | 18h 33m 57.76631s[2] |
| Declination | −33° 00′ 59.6170″[2] |
| Apparent magnitude (V) | 5.28[1] |
| Characteristics | |
| Spectral type | B2III/IV[1] |
| B−V color index | −0.115[1] |
| Variable type | SPB?[3] |
| Astrometry | |
| Proper motion (μ) | RA: +1.691[2] mas/yr Dec.: −11.670[2] mas/yr |
| Parallax (π) | 2.7191 ± 0.1688[2] mas |
| Distance | 1,200 ± 70 ly (370 ± 20 pc) |
| Absolute magnitude (MV) | −2.73[1] |
| Details[4] | |
| Mass | 7.3±0.5 M☉ |
| Radius | 5.3±0.7 R☉ |
| Luminosity | 3200±700 L☉ |
| Surface gravity (log g) | 3.81±0.20 cgs |
| Temperature | 18800±900 K |
| Rotational velocity (v sin i) | 107±16 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 171034, also named Alwasl, is a star in the constellation Sagittarius, about 1,200 light-years (370 parsecs) distant. With an apparent magnitude of 5.28, it is faintly visible to the naked eye under good viewing conditions. Its stellar classification is variously reported as B2III/IV[1] or B2IV/V,[6] indicating a B-type star of uncertain luminosity class. It is a possible Beta Cephei variable[4] or slowly pulsating B-type star.[3] A companion star at a separation of 0.25″ was first reported in 2010.[6]
In traditional Arab astronomy, al-Waṣl (الوَصْل), meaning the joint or connection, refers to the region between two asterisms in Sagittarius representing groups of ostriches – al-Naʿām al-Wārid "the incoming ostriches" and al-Naʿām al-Ṣādir "the outgoing ostriches". The IAU Working Group on Star Names adopted the name Alwasl for this star on 13 August 2026.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Balona, L. A.; Ozuyar, D. (April 2020). "Pulsation among TESS A and B stars and the Maia variables" (in en). Monthly Notices of the Royal Astronomical Society 493 (4): 5871–5879. doi:10.1093/mnras/staa670. ISSN 0035-8711. Bibcode: 2020MNRAS.493.5871B. Catalog in VizieR
- ↑ 4.0 4.1 Hubrig, S.; Briquet, M. et al. (April 2009). "New magnetic field measurements of β Cephei stars and slowly pulsating B stars" (in en). Astronomische Nachrichten 330 (4): 317–329. doi:10.1002/asna.200811187. ISSN 0004-6337. Bibcode: 2009AN....330..317H.
- ↑ "HD 171034". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+171034.
- ↑ 6.0 6.1 Oudmaijer, René D.; Parr, Andrew M. (July 2010). "The binary fraction and mass ratio of Be and B stars: a comparative Very Large Telescope/NACO study" (in en). Monthly Notices of the Royal Astronomical Society 405 (4): 2439-2446. doi:10.1111/j.1365-2966.2010.16609.x. Bibcode: 2010MNRAS.405.2439O.
- ↑ "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/.
External links
- al-Waṣl (الوصل) in the All Skies Encyclopaedia
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