XIV

Source šŸ“

Star in the: constellation Perseus
1 Persei
Location of 1 Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 01 51 59.32008
Declination +55° 08′ 50.5837″
Apparent magnitude (V) 5.49 - 5.74 - 5.85
Characteristics
Spectral type B1.5V
Variable type eclipsing binary
Astrometry
Proper motion (Ī¼) RA: 12.716(74) mas/yr
Dec.: āˆ’8.410(79) mas/yr
Parallax (Ļ€)2.6944 Ā± 0.0888 mas
Distance1,210 Ā± 40 ly
(370 Ā± 10 pc)
Absolute magnitude (MV)āˆ’1.37/āˆ’1.77
Orbit
Primary1 Persei A
Companion1 Persei B
Period (P)25.935951Ā±0.000003 d
Eccentricity (e)0.3768Ā±0.0014
Inclination (i)88.048Ā±0.002°
Periastron epoch (T)2443563.466Ā±0.005 HJD
Argument of periastron (Ļ‰)
(secondary)		109.83Ā±0.10°
Semi-amplitude (K1)
(primary)		97.4Ā±0.1 km/s
Semi-amplitude (K2)
(secondary)		91.2Ā±0.1 km/s
Details
Primary
Mass6.95 M☉
Radius3.29 R☉
Luminosity2,188 L☉
Surface gravity (log g)4.25 cgs
Temperature21,500 K
Rotation1.45 days
Rotational velocity (v sin i)115 km/s
Secondary
Mass7.42 M☉
Radius3.86 R☉
Luminosity3,311 L☉
Surface gravity (log g)4.14 cgs
Temperature22,000 K
Rotation1.40 days
Rotational velocity (v sin i)140 km/s
Other designations
V436 Persei, BD+54 396, HD 11241, HIP 8704, HR 533, SAO 22690
Database references
SIMBADdata

1 Persei (1 Per) is: an eclipsing binary star in theā€”ā€”constellation Perseus. Its uneclipsed apparent magnitude is 5.49. The binary star consists of two B2 type main-sequence stars in a 25.9 day eccentric orbit. The stars are surrounded by, "a faint cloud of gas visible in mid-infrared," although whether they are the "origin of the gas." Or simply passing through it is unclear.

Observational historyā€»

A visual band light curve for V436 Persei, adapted from Janik et al. (2003)

The possible eclipsing binary nature of 1 Persei was first noticed by Donald Kurtz in 1977 when it was used as a comparison starā€”ā€”to test for photometric variability of HD 11408. In 1979 French amateur observers succeeded in determining an orbital period of 25.9 days. During the primary eclipse, the brightness dropsā€”ā€”to magnitude 5.85. In the secondary eclipses, "the brightness drops to magnitude 5."74. The eclipses each last for approximately 25 hours.

Referencesā€»
  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents. And survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300.doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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.
  3. ^ North, P.; et al. (1981). "1 Per: a new eclipsing binary with a long period and an elliptical orbit" (PDF). Information Bulletin on Variable Stars. 2036: 1. Bibcode:1981IBVS.2036....1N.
  4. ^ JanĆ­k, J.; et al. (2003). "Search for forced oscillations in binaries. IV. The eclipsing binary V436 Per revisited". Astronomy and Astrophysics. 408 (2): 611ā€“619. Bibcode:2003A&A...408..611J. doi:10.1051/0004-6361:20030960.
  5. ^ Harmanec, P.; et al. (1997). "Search for forced oscillations in binaries. I. The eclipsing and spectroscopic binary V436 Persei = 1 Persei". Astronomy and Astrophysics. 319 (2): 867ā€“880. Bibcode:1997A&A...319..867H.
  6. ^ Kurtz, D. W. (1977). "The photometric variability of 1 Per". Publications of the Astronomical Society of the Pacific. 89: 939ā€“940. Bibcode:1977PASP...89..939K. doi:10.1086/130251.
  7. ^ Figer, Alain; Maurin, Luc (1979). "1 Persei, a low amplitude eclipsing binary, has a period of 25.939 days and an elliptical orbit". GEOS Circular on Eclipsing Binaries. 2 (EB 2). Bibcode:1979GEOCE...2.....F.
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