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Chi Draconis

{{Short description|Star in the constellation of Draco}}

{{Starbox begin

| name=χ Draconis

}}

{{Starbox image

| image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=χ Draconis

|x=320|y=498

}}

|caption=Location of χ Draconis (circled)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|18|21|03.38255}}

| dec={{DEC|+72|43|58.2518}}

| appmag_v=3.570

| constell=Draco

}}

{{Starbox character

| class=F7V / K0V

| b-v=+0.49

| u-b=−0.06

| variable=Suspected

}}

{{Starbox astrometry

| radial_v=+32.4

| prop_mo_ra=+531.21

| prop_mo_dec=−349.71

| parallax=120.05

| p_error=0.15

| parallax_footnote=

| absmag_v=4.04

}}

{{Starbox orbit

| reference=

| primary=χ Dra Aa

| name=χ Dra Ab

| period={{val|fmt=commas|0.7680599|0.000061}}

| axis={{val|0.1244|0.0011}}

| eccentricity={{val|0.428|0.012}}

| inclination={{val|74.42|0.58}}

| node={{val|230.30|0.51}}

| periarg={{val|119.3|1.1}}

| periastron={{val|fmt=commas|1984.8324|0.0026}}

}}

{{Starbox detail

| component1=χ Dra Aa

| mass={{val|1.029|0.026}}

| radius={{val|1.20|0.09}}

| luminosity=1.86

| temperature={{val|fmt=commas|6,150|150}}

| metal_fe=−0.41

| rotational_velocity=11

| age_gyr=5.3

| component2=χ Dra Ab

| mass2={{val|0.748|0.017}}

| radius2={{val|0.73|0.11}}

| temperature2={{val|fmt=commas|4,940|200}}

| luminosity2=0.29

}}

{{Starbox catalog

| names=χ Dra, 44 Dra, BD+72°839, FK5 695, Gl 713, HD 170153, HIP 89937, HR 6927, LHS 3379, LTT 15438, SAO 9087, NSV 10749

}}

{{Starbox reference

|Simbad=chi+Dra

}}

{{Starbox end}}

Chi Draconis (χ Dra, χ Draconis, Chi Draconis) is a magnitude 3.6 binary star in the constellation Draco. It also has the Flamsteed designation 44 Draconis. At a distance of 27 light-years, it is one of the 200 or so closest stars.

Binary system

File:Chi Draconis.jpg

χ Draconis is a spectroscopic binary which has been resolved using speckle interferometry. The primary is an F7 main sequence star. The spectral type of the companion cannot be determined directly with any accuracy, but is known to be between G8 and K2 and is assumed to be K0. The properties of the secondary suggest that it is also a main-sequence star. The separation of the two stars varies between about {{val|0.05|ul="}} and {{val|0.2|u="}} during the eccentric 182-day orbit.

The primary star has a mass fractionally higher than the Sun's, but is significantly larger and hotter resulting in it being 86% more luminous. Its age is estimated to be about five billion years.

The secondary only has about three-quarters the mass of the Sun and is both cooler and smaller. It is only about 29% as luminous. It is calculated to be 2.13 magnitudes fainter than the primary, so it would be of sixth magnitude if visible alone.

Visual companions

Multiple star catalogues list faint widely-separated visible companion stars: a 12th-magnitude star and a 14th-magnitude star about {{val|3|ul='}} from χ Draconis, but only about {{val|10|u="}} from each-other. Both have much smaller parallaxes than χ Draconis and are unrelated background objects.

See also

References

{{reflist|30em|refs=

{{cite Gaia DR3}}

{{cite journal |last1=Mason |first1=Brian D. |last2=Wycoff |first2=Gary L. |last3=Hartkopf |first3=William I. |last4=Douglass |first4=Geoffrey G. |last5=Worley |first5=Charles E. |title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog |journal=The Astronomical Journal |date=December 2001 |volume=122 |issue=6 |pages=3466–3471 |doi=10.1086/323920 |issn=0004-6256 |bibcode=2001AJ....122.3466M |doi-access=free}}

{{cite journal |bibcode=1987AJ.....93.1236T |title=The Orbit of the Speckle and Double-Lined Spectroscopic Binary Chi Draconis |last1=Tomkin |first1=Jocelyn |last2=McAlister |first2=Harold A. |last3=Hartkopf |first3=William I. |last4=Fekel |first4=Francis C. |journal=The Astronomical Journal |date=1987 |volume=93 |page=1236 |doi=10.1086/114404 |doi-access=free }}

{{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|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal|bibcode=1991bsc..book.....H|title=The Bright star catalogue|journal=New Haven|last1=Hoffleit|first1=Dorrit|last2=Jaschek|first2=Carlos|year=1991}}

{{cite journal | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 |date=November 2007 | pages=653–664 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V | arxiv=0708.1752 | s2cid=18759600 }}

{{cite web | title=chi Dra -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=chi+Dra | accessdate=2011-10-15 }}

{{cite journal | title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs | display-authors=1 | last1=Nordström | first1=B. | last2=Mayor | first2=M. | last3=Andersen | first3=J. | last4=Holmberg | first4=J. | last5=Pont | first5=F. | last6=Jørgensen | first6=B. R. | last7=Olsen | first7=E. H. | last8=Udry | first8=S. | last9=Mowlavi | first9=N. | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019 |date=May 2004 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N |arxiv = astro-ph/0405198 | s2cid=11027621 }}

{{Cite journal |first1=D. N. |last1=Monin |first2=S. N. |last2=Fabrika |first3=G. G. |last3=Valyavin |year=2002 |title=Magnetic survey of bright northern main sequence stars |journal=Astronomy & Astrophysics |volume=396 |issue=1 |pages=131–141 |doi=10.1051/0004-6361:20021425 |bibcode=2002A&A...396..131M|doi-access=free }}

{{cite journal | display-authors=1 | last1=Farrington | first1=C. D. | last2=ten Brummelaar | first2=T. A. | last3=Mason | first3=B. D. | last4=Hartkopf | first4=W. I. | last5=Alister | first5=H. A. | last6=Raghavan | first6=D. | last7=Turner | first7=N. H. | last8=Sturmann | first8=L. | last9=Sturmann | first9=J. | title=Separated Fringe Packet Observations with the CHARA Array. I. Methods and New Orbits for χ Draconis, HD 184467, and HD 198084 | journal=The Astronomical Journal | volume=139 | issue=6 | pages=2308–2318 |date=June 2010 | doi=10.1088/0004-6256/139/6/2308 | bibcode=2010AJ....139.2308F | doi-access=free }}

{{cite journal | last1=Torres | first1=G. | last2=Andersen | first2=J. | last3=Giménez | first3=A. | title=Accurate masses and radii of normal stars: modern results and applications | journal=The Astronomy and Astrophysics Review | year=2010 | volume=18 | issue=1–2 | pages=67–126 | doi=10.1007/s00159-009-0025-1 | bibcode=2010A&ARv..18...67T |arxiv = 0908.2624 | s2cid=14006009 }} See p. 56, entry #15.

{{cite journal |last1=Hutter |first1=D. J. |last2=Zavala |first2=R. T. |last3=Tycner |first3=C. |last4=Benson |first4=J. A. |last5=Hummel |first5=C. A. |last6=Sanborn |first6=J. |last7=Franz |first7=O. G. |last8=Johnston |first8=K. J. |title=Surveying the Bright Stars by Optical Interferometry. I. A Search for Multiplicity Among Stars of Spectral Types F-K |journal=The Astrophysical Journal Supplement Series |date=9 November 2016 |volume=227 |issue=1 |pages=4 |doi=10.3847/0067-0049/227/1/4|arxiv=1609.05254 |bibcode=2016ApJS..227....4H |s2cid=118803592 |doi-access=free }}

{{cite journal |first1=Céline |last1=Reylé |first2=Kevin |last2=Jardine |first3=Pascal |last3=Fouqué |first4=Jose A. |last4=Caballero |first5=Richard L. |last5=Smart |first6=Alessandro |last6=Sozzetti |date=30 April 2021 |title=The 10 parsec sample in the Gaia era |journal=Astronomy & Astrophysics |volume=650 |issue= |pages=A201 |doi=10.1051/0004-6361/202140985 |arxiv=2104.14972 |bibcode=2021A&A...650A.201R |s2cid=233476431}} Data available at https://gruze.org/10pc/ {{Webarchive|url=https://web.archive.org/web/20230312171927/http://gruze.org/10pc/ |date=12 March 2023 }}

}}

External links

  • [https://web.archive.org/web/20051024072413/http://www.ari.uni-heidelberg.de/aricns/cnspages/4c01485.htm ARICNS]
  • [http://www.solstation.com/stars/chidrac2.htm Chi Draconis 2] at SolStation.
  • [https://web.archive.org/web/20050928213551/http://nstars.arc.nasa.gov/searches/starinfo.cfm?partb=1821p7243&starpage=0 nStars database entry]

{{Stars of Draco}}

Category:Draco (constellation)

Category:Binary stars

Draconis, Chi

Category:F-type main-sequence stars

Category:K-type main-sequence stars

089937

Draconis, 44

6927

170153

Category:Durchmusterung objects

0713