1 Persei

{{Starbox begin

| name = 1 Persei

}}

{{Starbox image

| image=

{{Location mark

|image=Perseus constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=1 Per

|x=901|y=204

}}

| caption = Location of 1 Persei (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Perseus

| ra = {{RA|01|51|59.32008}}

| dec = {{DEC|+55|08|50.5837}}

| appmag_v = 5.49 - 5.74 - 5.85

}}

{{Starbox character

| class = B1.5V

| b-v =

| u-b =

| variable = eclipsing binary

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|12.716|(74)}}

| prop_mo_dec = {{val|−8.410|(79)}}

| parallax = 2.6944

| p_error = 0.0888

| parallax_footnote =

| absmag_v = −1.37/−1.77

}}

{{Starbox orbit

| reference =

| primary = 1 Persei A

| name = 1 Persei B

| period_unitless = {{val|25.935951|0.000003|u=days}}

| axis =

| axis_unitless =

| eccentricity = {{val|0.3768|0.0014}}

| inclination = {{val|88.048|0.002}}

| node =

| periastron = {{val|2443563.466|0.005|u=HJD}}

| periarg = {{val|109.83|0.10}}

| k1 = {{val|97.4|0.1}}

| k2 = {{val|91.2|0.1}}

}}

{{Starbox detail

| source =

| component1 = Primary

| mass = 6.95

| temperature = 21,500

| radius = 3.29

| luminosity = 2,188

| gravity = 4.25

| rotational_velocity = 115

| rotation = 1.45 days

| component2 = Secondary

| mass2 = 7.42

| temperature2 = 22,000

| radius2 = 3.86

| luminosity2 = 3,311

| gravity2 = 4.14

| rotational_velocity2 = 140

| rotation2 = 1.40 days

}}

{{Starbox catalog

| names = {{odlist | V=V436 Persei | HR=533 | HD=11241 | BD=+54 396 | HIP=8704 | SAO=22690}}

}}

{{Starbox reference

| Simbad = 1+Per

}}

1 Persei (1 Per) is an eclipsing binary star in the 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 history

File:V436PerLightCurve.png 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 star 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 drops to magnitude 5.85. In the secondary eclipses, the brightness drops to magnitude 5.74. The eclipses each last for approximately 25 hours.

References

{{reflist|refs=

{{cite journal | title=1 Persei, a low amplitude eclipsing binary, has a period of 25.939 days and an elliptical orbit | url=http://geos.upv.es/index.php/publications/Geos-Circulars/GEOSEB02/ | last1=Figer | first1=Alain | last2=Maurin | first2=Luc | journal=GEOS Circular on Eclipsing Binaries | number=EB 2 | year=1979 | volume=2 | bibcode=1979GEOCE...2.....F }}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal | title=Search for forced oscillations in binaries. I. The eclipsing and spectroscopic binary V436 Persei = 1 Persei | last1=Harmanec | first1=P. | last2=Hadrava | first2=P. | last3=Yang | first3=S. | last4=Holmgren | first4=D. | last5=North | first5=N. | last6=Koubský | first6=P. | last7=Kubát | first7=j. | last8=Poretti | first8=E. | display-authors=1 | journal=Astronomy and Astrophysics | volume=319 | issue=2 | pages=867–880 | year=1997 | bibcode=1997A&A...319..867H }}

{{cite journal | title=Search for forced oscillations in binaries. IV. The eclipsing binary V436 Per revisited | last1=Janík | first1=J. | last2=Harmanec | first2=P. | last3=Lehmann | first3=H. | last4=Yang | first4=S. | last5=Božić | first5=H. | last6=Ak | first6=H. | last7=Hadrava | first7=P. | last8=Eenens | first8=P. | last9=Ruždjak | first9=D. | last10=Sudar | first10=D. | last11=Hubeny | first11=I. | last12=Linnell | first12=A. P. | display-authors=1 | journal=Astronomy and Astrophysics | volume=408 | issue=2 | pages=611–619 | year=2003 | bibcode=2003A&A...408..611J | doi=10.1051/0004-6361:20030960 | doi-access=free }}

{{cite journal | title=The photometric variability of 1 Per | last1=Kurtz | first1=D. W. | journal=Publications of the Astronomical Society of the Pacific | volume=89 | pages=939–940 | year=1977 | bibcode=1977PASP...89..939K | doi=10.1086/130251 | doi-access=free }}

{{cite journal | title=1 Per: a new eclipsing binary with a long period and an elliptical orbit | url=https://konkoly.hu/pub/ibvs/2001/2036.pdf | last1=North | first1=P. | last2=Rufener | first2=F. | last3=Figer | first3=A. | last4=Maurin | first4=L. | display-authors=1 | journal=Information Bulletin on Variable Stars | volume=2036 | year=1981 | page=1 | bibcode=1981IBVS.2036....1N }}

}}

Category:Perseus (constellation)

Category:B-type main-sequence stars

Category:Algol variables

Persei, 01

Category:Eclipsing binaries

Category:Durchmusterung objects