HD 168625

HD 168625
Data pengamatan; Epos J2000 Ekuinoks J2000
Rasi bintang	Sagittarius
Asensio rekta	18j 21m 19.548d
Deklinasi	-16° 22′ 16.0572″
Magnitudo tampak (V)	8.30 - 8.41
Ciri-ciri
Kelas spektrum	B6Ia+ (B2 - B8)
Indeks warna U−B	+0.37
Indeks warna B−V	+1.41
Indeks warna J−K	0.599
Jenis variabel	α Cygni
Astrometri
Kecepatan radial (Rv)	-4.00 km/s
Gerak diri (μ)	RA: -0.71 ± 1.20 mdb/thn ; Dek.: +0.01 ± 0.74 mdb/thn
Paralaks (π)	0,6212±0,0640 mdb
Jarak	sekitar 5.300 tc ; (sekitar 1.600 pc)
Magnitudo mutlak (MV)	−8.39
Detail
Luminositas	380,000 L☉
Gravitasi permukaan (log g)	1.74
Suhu	14,000 K
Kecepatan rotasi (v sin i)	60 km/s
Penamaan lain
	V4030 Sgr, HD 168625, BD -16°4830, SAO 161375, HIP 89963, AAVSO 1815-168
Referensi basis data
SIMBAD	data

HD 168625 (V4030 Sagittarii) adalah Bintang hiper raksasa biru dan merupakan calon variabel biru bercahaya yang terletak di konstelasi Sagitarius, mudah dilihat dengan teleskop amatir. Bintang Ini merupakan salah satu pasangan visual dengan hiper raksasa biru (dan variabel biru bercahaya) HD 168607 dan terletak di tenggara M17, Nebula Omega.

Nebula

Karakteristik yang paling menonjol dari HD 168625 adalah adanya nebula yang mengelilinginya yang ditemukan pada tahun 1994^[9] dan telah dipelajari dengan bantuan beberapa instrumen dan observatorium serta teleskop yang mencakup antara lain Teleskop Luar Angkasa Hubble^[10] dan yang VLT.^[11]

Studi tersebut menunjukkan bahwa HD 168625 sebenarnya dikelilingi oleh dua nebula: bagian dalam yang memiliki bentuk elips dan struktur yang sangat kompleks yang mencakup busur dan filamen, dan yang jauh lebih besar ditemukan dengan bantuan Teleskop Luar Angkasa Spitzer yang memiliki bentuk bipolar dan terlihat seperti tiruan dari yang mengelilingi Sanduleak -69° 202, nenek moyang supernova 1987A di Awan Magellan Besar. Hal ini menunjukkan Sanduleak -69° 202 juga merupakan variabel biru bercahaya serta kemungkinan HD 168625 meledak sebagai supernova Tipe II dalam waktu dekat.^[9]

Referensi

^ ^a ^b ^c ^d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ Chentsov, E. L.; Ermakov, S. V.; Klochkova, V. G.; Panchuk, V. E.; Bjorkman, K. S.; Miroshnichenko, A. S. (2003). "An atlas of spectra of B6-A2 hypergiants and supergiants from 4800 to 6700Å". Astronomy and Astrophysics. 397 (3): 1035–1042. Bibcode:2003A&A...397.1035C. doi:10.1051/0004-6361:20021430 .
^ ^a ^b ^c Mahy, L.; Hutsemékers, D.; Royer, P.; Waelkens, C. (2016). "Tracing back the evolution of the candidate LBV HD168625". Astronomy & Astrophysics. 594: A94. arXiv:1608.01087 . Bibcode:2016A&A...594A..94M. doi:10.1051/0004-6361/201628584.
^ ^a ^b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
^ Sterken, C.; Arentoft, T.; Duerbeck, H. W.; Brogt, E. (1999). "Light variations of the blue hypergiants HD 168607 and HD 168625 (1973-1999)". Astronomy and Astrophysics. 349: 532. Bibcode:1999A&A...349..532S.
^ Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
^ Brown, A. G. A.; et al. (kolaborasi Gaia) (Agustus 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 . Catatan Gaia DR2 untuk sumber tersebut di VizieR.
^ ^a ^b Smith, Nathan (2007-02-07). "Discovery of a Nearby Twin of SN 1987A's Nebula around the Luminous Blue Variable HD 168625: Was Sk -69 202 an LBV?". The Astronomical Journal. 133 (3): 1034–1040. doi:10.1086/510838. ISSN 0004-6256.
^ Pasquali, A.; Nota, A.; Smith, L. J.; Akiyama, S.; Messineo, M.; Clampin, M. (2002-09). "Multiwavelength Study of the Nebula Associated with the Galactic LBV Candidate HD 168625". The Astronomical Journal. 124 (3): 1625–1635. doi:10.1086/341820. ISSN 0004-6256.
^ Umana, G.; Buemi, C. S.; Trigilio, C.; Leto, P.; Hora, J. L. (2010-07-12). "SPITZER, VERY LARGE TELESCOPE, AND VERY LARGE ARRAY OBSERVATIONS OF THE GALACTIC LUMINOUS BLUE VARIABLE CANDIDATE HD 168625". The Astrophysical Journal. 718 (2): 1036–1045. doi:10.1088/0004-637x/718/2/1036. ISSN 0004-637X.

[hipparcos-1] Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.

[gcvs-2] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[chentsov-3] Chentsov, E. L.; Ermakov, S. V.; Klochkova, V. G.; Panchuk, V. E.; Bjorkman, K. S.; Miroshnichenko, A. S. (2003). "An atlas of spectra of B6-A2 hypergiants and supergiants from 4800 to 6700Å". Astronomy and Astrophysics. 397 (3): 1035–1042. Bibcode:2003A&A...397.1035C. doi:10.1051/0004-6361:20021430 .

[mahy-4] Mahy, L.; Hutsemékers, D.; Royer, P.; Waelkens, C. (2016). "Tracing back the evolution of the candidate LBV HD168625". Astronomy & Astrophysics. 594: A94. arXiv:1608.01087 . Bibcode:2016A&A...594A..94M. doi:10.1051/0004-6361/201628584.

[ducati-5] Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.

[sterken-6] Sterken, C.; Arentoft, T.; Duerbeck, H. W.; Brogt, E. (1999). "Light variations of the blue hypergiants HD 168607 and HD 168625 (1973-1999)". Astronomy and Astrophysics. 349: 532. Bibcode:1999A&A...349..532S.

[KharchenkoScholz2007-7] Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.

[dr2-8] Brown, A. G. A.; et al. (kolaborasi Gaia) (Agustus 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 . Catatan Gaia DR2 untuk sumber tersebut di VizieR.

[Smith_1034–1040-9] Smith, Nathan (2007-02-07). "Discovery of a Nearby Twin of SN 1987A's Nebula around the Luminous Blue Variable HD 168625: Was Sk -69 202 an LBV?". The Astronomical Journal. 133 (3): 1034–1040. doi:10.1086/510838. ISSN 0004-6256.

[10] Pasquali, A.; Nota, A.; Smith, L. J.; Akiyama, S.; Messineo, M.; Clampin, M. (2002-09). "Multiwavelength Study of the Nebula Associated with the Galactic LBV Candidate HD 168625". The Astronomical Journal. 124 (3): 1625–1635. doi:10.1086/341820. ISSN 0004-6256.

[11] Umana, G.; Buemi, C. S.; Trigilio, C.; Leto, P.; Hora, J. L. (2010-07-12). "SPITZER, VERY LARGE TELESCOPE, AND VERY LARGE ARRAY OBSERVATIONS OF THE GALACTIC LUMINOUS BLUE VARIABLE CANDIDATE HD 168625". The Astrophysical Journal. 718 (2): 1036–1045. doi:10.1088/0004-637x/718/2/1036. ISSN 0004-637X.

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HD 168625

Nebula

Referensi

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