V380 Cygni

{{Starbox image

| image = 250px

| caption = A light curve for V380 Cygni, adapted from Tkachenko et al. (2012). The blue points in the upper panel show Kepler data. The red line shows a model for the light curve which assumes the two stars have no intrinsic variability. The bottom panel shows the Kepler data with the model subtracted, revealing the intrinsic variability.

}}

{{Starbox observe

| epoch = J2000.0

| ra = {{RA|19|50|37.32678}}

| dec = {{DEC|+40|35|59.1351}}

| appmag_v = 5.61 - 5.78

| constell = Cassiopeia

}}

{{Starbox character

| class = B1.5 II-III(primary) + B2 V(secondary)

| b-v =

| u-b =

| variable = Algol / detached

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|-3.125|0.055}}

| prop_mo_dec = {{val|-8.067|0.053}}

| parallax = 0.8673

| p_error = 0.0510

| parallax_footnote =

| absmag_v =

}}

{{Starbox orbit

| reference =

| primary =

| name =

| period_unitless = {{val|fmt=commas|12.425719|0.000014|ul=days}}

| eccentricity = {{val|0.234|0.006}}

| axis_unitless =

| inclination = {{val|82.4|0.02}}

| node =

| periastron =

| periarg =

| periarg_primary =

| k1 = {{val|94.5|1.5}}

| k2 = {{val|151.1|3.0}}

}}

{{Starbox detail

| component1 = Primary

| mass = {{val|11.80|0.13}}

| radius = {{val|16.00|0.13}}

| luminosity = {{val|fmt=commas|54200|2700}}

| temperature = 21,500

| metal_fe =

| gravity = {{val|3.102|0.007}}

| rotational_velocity =

| age_gyr =

| component2 = Secondary

| mass2 = {{val|7.194|0.055}}

| radius2 = {{val|3.904|0.067}}

| luminosity2 = {{val|fmt=commas|3000|320}}

| temperature2 = 22,000

| gravity2 = {{val|4.112|0.015}}

| rotational_velocity2 =

| age_gyr2 =

}}

{{Starbox catalog

| names = HD 187879, BD+40 3902, HIP 97634, HR 7567, SAO 48892, Boss 5070

}}

{{Starbox reference

| Simbad = V380+Cyg

}}

V380 Cygni is an eclipsing binary star in the constellation Cygnus, located about 3,800 light years away from the Earth. Its apparent magnitude ranges from 5.61 to 5.78, making it faintly visible to the naked eye of an observer located far from city lights. Because it is an important test object for models of massive stars, it has been the subject of many scientific studies.

V380 Cygni was discovered to be a spectroscopic binary by Walter Sydney Adams, based on three spectra taken on separate nights in 1912 at the Mount Wilson Observatory. The binary's orbit was first calculated from spectra obtained in 1920 at the DDO; the period was found to be 12.427 days. Because the physical separation of spectroscopic binaries is often relatively small, they are good candidates to be eclipsing binaries. For that reason, in 1923 Joel Stebbins included V380 Cygni (then called Boss 5070) in an early photo-electric photometry study. A secondary eclipse was detected in June 1923 on the first night the star was observed.

V380 Cygni was observed several times at high cadence, for many days, by the Kepler space telescope. In addition to the brightness variations caused by eclipses, the Kepler data showed that the primary star has significant intrinsic variability which is most apt to be caused by gravity-mode oscillations.

References

{{Reflist|30em|refs=

{{cite journal

| bibcode=2017ARep...61...80S

| title=General catalogue of variable stars: Version GCVS 5.1

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.

| doi=10.1134/S1063772917010085 | s2cid=125853869 }}

{{cite simbad

| title= V380 Cyg -- Eclipsing Binary| access-date=2023-01-12 }}

{{cite journal

| last1=Adams | first1=W. S. | title=Ten Spectroscopic Binaries

| journal=Publications of the Astronomical Society of the Pacific

| date=December 1914 | volume=26 | issue=156 | page=261

| doi=10.1086/122362 | bibcode=1914PASP...26..261A

| s2cid=122672368 | doi-access=free }}

{{cite journal

| last1=Harper | first1=W. E. | title=The orbit of the spectroscopic binary Boss 5070

| journal=Publications of the Dominion Astrophysical Observatory Victoria

| date=January 1920 | volume=1 | pages=257–261 | bibcode=1920PDAO....1..257H

| url=https://ui.adsabs.harvard.edu/abs/1920PDAO....1..257H | access-date=13 January 2023}}

{{cite journal

| last1=Stebbins | first1=Joel

| title=Photo-Electric Photometry of Stars. Chapter VIII. Discovery of Eclipsing Stars

| journal=Publications of the Washburn Observatory

| date=January 1928 | volume=15 | pages=55–58 | bibcode=1928PWasO..15...55S

| url=https://ui.adsabs.harvard.edu/abs/1928PWasO..15...55S | access-date=13 January 2023}}

{{cite journal

| last1=Kron | first1=Gerald E. | title=Photometric Elements of Boss 5070

| journal=Astrophysical Journal | date=October 1935 | volume=82 | page=225

| doi=10.1086/143671 | bibcode=1935ApJ....82..225K

| doi-access=free }}

{{cite journal

| last19=Sanderfer | first19=D. T. | last20=Seader | first20=S. E.

| title=Detection of gravity modes in the massive binary V380 Cyg from Kepler space-based photometry and high-resolution spectroscopy

| journal=Monthly Notices of the Royal Astronomical Society: Letters

| date=July 2012 | volume=424 | issue=1 | page=L21-L25

| doi=10.1111/j.1745-3933.2012.01277.x | doi-access=free | arxiv=1205.0554 | bibcode=2012MNRAS.424L..21T

| s2cid=54027022 }}

{{cite journal

| last7=Popper | first7=Daniel M.

| title=Eclipsing Binaries as Astrophysical Laboratories: Internal Structure, Core Convection, and Evolution of the B-Star Components of V380 Cygni

| doi=10.1086/317211 | arxiv=astro-ph/0005029 | bibcode=2000ApJ...544..409G

| s2cid=13454782 | url=https://ui.adsabs.harvard.edu/abs/2000ApJ...544..409G | access-date=14 January 2023}}

{{cite journal

| last1=Hill | first1=G. | last2=Batten | first2=A. H.

| title=Studies of early-type variable stars. III. The orbit and physical dimensions for V380 Cygni

| url=https://ui.adsabs.harvard.edu/abs/1984A&A...141...39H | access-date=14 January 2023}}

}}

Category:Algol variables

Category:Cygnus (constellation)

97634

187879

Category:Durchmusterung objects

Cygni, V380

7567