Gamma Ophiuchi

{{Starbox begin

| name=γ Ophiuchi

}}

{{Starbox image

| image =

{{Location mark

| image=Ophiuchus IAU.svg

| float=center | width=250 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=γ Oph

| x%=39.3 | y%=28.8

}}

| caption=Location of γ Ophiuchi (circled)

}}

{{Starbox observe

| epoch = J2000.0

| ra = {{RA|17|47|53.55973}}

| dec = {{DEC|+02|42|26.2000}}

| appmag_v = +3.753

| constell = Ophiuchus

}}

{{Starbox character

| class = A0 V or A1VnkA0mA0

| b-v = +0.033

| u-b = +0.040

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|-7.6|0.3}}

| prop_mo_ra=−24.64

| prop_mo_dec=−74.42

| parallax = 31.73

| p_error = 0.21

| parallax_footnote=

| absmag_v = +1.26

}}

{{Starbox detail

| mass = 2.9

| radius = 1.91

| luminosity = 29

| temperature = {{val|9506|fmt=commas}}

| metal_fe =

| gravity = 4.03

| rotational_velocity = 220

| age_myr = {{val|184|+93|-134}}

}}

{{Starbox catalog

| names = {{odlist | name=Bake-eo, Bake Eo | B=γ Oph | F=62 Ophiuchi | BD=+02 3403 | FK5=668 | HD=161868 | HIP=87108 | HR=6629 | SAO=122754 | GC=24162 }}

}}

{{Starbox reference

| Simbad = gam+Oph

}}

Gamma Ophiuchi, Latinized from γ Ophiuchi, also named Bake-eo, is a fourth-magnitude star in the constellation Ophiuchus. Together with Beta Ophiuchi, it forms the serpent-holder's right shoulder. The star is visible to the naked eye with an apparent visual magnitude of +3.75. Based upon an annual parallax shift of {{val|31.73|ul=mas}} as seen from Earth, it is located 103 light-years from the Sun. It is moving closer to the Sun with a radial velocity of −7.6 km/s.

Nomenclature

This star is known also as Muliphen,{{cite web

|title=LacusCurtius • Allen's Star Names — Ophiuchus

|first=Richard|last=Hinckley Allen

|url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Ophiuchus*.html

|access-date=2017-01-03}}{{cite web

|title=Muliphen

|first=Jim|last=Kaler

|url=http://stars.astro.illinois.edu/sow/muliphen.html

|access-date=2017-01-03}} although at least two more stars are known with this name: Gamma Canis Majoris (often spelled as Muliphein) and Gamma Centauri (often spelled as Muhlifain). Muliphein is the IAU-approved name of Gamma Canis Majoris.

This star has the Marshallese name Bake-eo (or Bake Eo, pronounced "bakey-yew"), which refers to the spondylus mussel. The IAU Working Group on Star Names approved the name Bake-eo for this star on 20 August 2024 and it is now so entered in the IAU Catalog of Star Names.

Description

{{CSS image crop|Image=The 74 exocomet belts imaged by ALMA’s REASONS survey, showing belts of all shapes, sizes and ages (REASONS comboplot full nonames).jpg|bSize=2400|cWidth=240|cHeight=240|oTop=1200|oLeft=1673|Location=left|Description=Image of the debris disk from the REASONS survey}}

This is an A-type main sequence star with a stellar classification of A0 V. Gray et al. (2003) lists a classification of A1VnkA0mA0, indicating it is of type A1 V with the calcium K-line and metallic lines of an A0 star. It is approximately 184 million years old and is spinning rapidly with a projected rotational velocity of 220 km/s. Gamma Ophiuchi has nearly three times the mass of the Sun and 1.8 times the Sun's radius. The star shines with 29 times the luminosity of the Sun, which is being emitted from its outer atmosphere at an effective temperature of {{val|9506|u=K}}. It is radiating an excess emission of infrared, suggesting the presence of a circumstellar disk of dust at an orbital radius of 64 AU from the host star. The disk was imaged in 2025.

{{Orbitbox planet begin

| table_ref =

}}

{{Orbitbox planet disk

| disk =

| periapsis = {{val|124|6|5}}

| inclination = {{val|68|2}}

}}

References

{{reflist|refs=

{{cite book

| title=Star Tales | publisher=Lutterworth Press

| first=Ian | last=Ridpath | date=June 28, 2018

| isbn=9780718847821 | page=189

| url=https://books.google.com/books?id=-dXYDwAAQBAJ&pg=PT189 }}

{{cite journal

| first=F. | last=van Leeuwen

| title=Validation of the New Hipparcos Reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–64 | date=2007

| bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357

| arxiv=0708.1752 | s2cid=18759600 }}

{{Cite journal |last=Rhee |first=Joseph H. |last2=Song |first2=Inseok |last3=Zuckerman |first3=B. |last4=McElwain |first4=Michael |date=May 2007 |title=Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs |bibcode=2007ApJ...660.1556R |journal=The Astrophysical Journal |language=en |volume=660 |issue=2 |pages=1556–1571 |doi=10.1086/509912 |issn=0004-637X|arxiv=astro-ph/0609555 }}

{{Cite journal

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 }}

{{Cite journal

| title=Standardisation of broad band photometry of equatorial standards

| journal=South Africa Astronomical Observatory Circular

| volume=8 | pages=59–67 | year=1984

| bibcode=1984SAAOC...8...59C

| last1=Cousins | first1=A. W. J. }}

{{cite journal | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770| title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample | journal=The Astronomical Journal | volume=132 | pages=161–170 | year=2006 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. | issue=1 | s2cid=119476992 }}

{{Cite journal | last1=Malagnini | first1=M. L. | last2=Morossi | first2=C. | title=Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars | journal=Astronomy and Astrophysics Supplement Series | volume=85 | issue=3 | pages=1015–1019 |date=November 1990 | bibcode=1990A&AS...85.1015M }}

{{Cite journal | display-authors=1 | last1=Wyatt | first1=M. C. | last2=Smith | first2=R. | last3=Su | first3=K. Y. L. | last4=Rieke | first4=G. H. | last5=Greaves | first5=J. S. | last6=Beichman | first6=C. A. | last7=Bryden | first7=G. | title=Steady State Evolution of Debris Disks around A Stars | journal=The Astrophysical Journal | volume=663 | issue=1 | pages=365–382 |date=July 2007 | doi=10.1086/518404 | bibcode=2007ApJ...663..365W |arxiv = astro-ph/0703608 | s2cid=18883195 }}

{{Cite journal | display-authors=1 | last1=Song | first1=Inseok | last2=Caillault | first2=J.-P. | last3=Barrado y Navascués | first3=David | last4=Stauffer | first4=John R. | title=Ages of A-Type Vega-like Stars from uvbyβ Photometry | journal=The Astrophysical Journal | volume=546 | issue=1 | pages=352–357 |date=February 2001 | doi=10.1086/318269 | bibcode=2001ApJ...546..352S |arxiv = astro-ph/0010102 | s2cid=18154947 }}

{{Cite journal |last1=Matrà |first1=L. |last2=Marino |first2=S. |last3=Wilner |first3=D. J. |last4=Kennedy |first4=G. M. |last5=Booth |first5=M. |last6=Krivov |first6=A. V. |last7=Williams |first7=J. P. |last8=Hughes |first8=A. M. |last9=del Burgo |first9=C. |date=January 2025 |title=REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths |journal=Astronomy & Astrophysics |volume=693 |issue= |pages=A151 |doi=10.1051/0004-6361/202451397 |arxiv=2501.09058 |bibcode=2025A&A...693A.151M}}

{{cite web |title=IAU Catalog of Star Names |url=https://exopla.net/star-names/modern-iau-star-names/ |access-date=22 February 2025}}

}}

Category:A-type main-sequence stars

Category:Circumstellar disks