V518 Carinae

{{Short description|Blue-hued variable star in the constellation Carina}}

{{Starbox image

| image=

{{Location mark

|image=The Southern Pleiades (IC 2602).jpg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=16|mark_link=V518 Car

|x=618|y=476

}}

|caption=Location of V518 Carinae in IC 2602 (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Carina

| ra = {{RA|10|42|14.12040}}

| dec = {{DEC|-64|27|59.1323}}

| appmag_v = 4.82

}}

{{Starbox character

| class = B3/5V

| b-v = −0.14

| u-b = −0.58

| variable = γ Cas?

}}

{{Starbox astrometry

| parallax = 7.19

| p_error = 0.20

| parallax_footnote =

| absmag_v = −1.169

}}

{{Starbox detail

| mass = 6.2

| radius = {{Val|3.30|0.07}}

| temperature = 15,397

| luminosity = 753

| gravity = 4.015

| rotational_velocity = 120

| age_myr = 17.2

}}

{{Starbox catalogue

| names = {{odlist|V=V518 Carinae|HR=4196|HD=92938|HIP=52370}}

}}

{{Starbox reference

| Simbad = V518+Carinae

}}

V518 Carinae (HR 4196) is a naked eye variable star in the constellation Carina. It is a member of the bright open cluster IC 2602 near the Carina Nebula.

Location

V518 Carinae lies in the open cluster IC 2602, 5 arc minutes from its brightest member θ Carinae.

Variability

File:V518CarLightCurve.png for V518 Carinae, plotted from Hipparcos data]]

V518 Carinae was discovered to change in brightness after analysis of Hipparcos photometry. The amplitude of the variations seen is 0.2 magnitudes, with possible periods of 100 and 971 days. It is classified as a γ Cassiopeiae variable.

Spectral peculiarities

V518 Carinae is classified as a B-type main sequence star between B3 and B5. It is also catalogued as a helium star, a chemically peculiar star with abnormally strong helium absorption lines in its spectrum and relatively weak hydrogen lines. It is possibly a blue straggler.

V518 Carinae is also a Be star, a hot star with emission lines in its spectrum due to a disk of material around the star. Be stars that show irregular brightness changes due to the disk are grouped as γ Cassiopeiae variables. V518 Carinae is known to produce disk outbursts lasting several hundred days.

References

{{reflist|refs=

{{cite web |title=Hipparcos Tools Interactive Data Access |url=https://www.cosmos.esa.int/web/hipparcos/interactive-data-access |website=Hipparcos |publisher=ESA |access-date=8 December 2021}}

{{cite journal|bibcode=2009A&A...507.1141L|title=A systematic study of variability among OB-stars based on HIPPARCOS photometry|journal=Astronomy and Astrophysics|volume=507|issue=2|pages=1141|last1=Lefèvre|first1=L|last2=Marchenko|first2=S. V|last3=Moffat|first3=A. F. J|last4=Acker|first4=A|year=2009|doi=10.1051/0004-6361/200912304|doi-access=free}}

{{cite journal|bibcode=2000IBVS.5008....1A|title=On the Variability of O4-B5 Luminosity Class III-V Stars|journal=Information Bulletin on Variable Stars|volume=5008|pages=1|last1=Adelman|first1=S. J|last2=Mayer|first2=M. R|last3=Rosidivito|first3=M. A|year=2000}}

{{cite journal|bibcode=2009PASP..121..125M|arxiv=0902.4279|title=L-Band Spectra of 13 Outbursting Be Stars|journal=Publications of the Astronomical Society of the Pacific|volume=121|issue=876|pages=125|last1=Mennickent|first1=R. E|last2=Sabogal|first2=B|last3=Granada|first3=A|last4=Cidale|first4=L|year=2009|doi=10.1086/597551|s2cid=119286005}}

{{cite journal|bibcode=2014yCat....1.2023S|title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)|journal=VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014)|volume=1|last1=Skiff|first1=B. A|year=2014}}

{{cite journal |last1=Kazarovets |first1=E. V. |last2=Samus |first2=N. N. |last3=Durlevich |first3=O. V. |last4=Frolov |first4=M. S. |last5=Antipin |first5=S. V. |last6=Kireeva |first6=N. N. |last7=Pastukhova |first7=E. N. |title=The 74th Special Name-list of Variable Stars |journal=Information Bulletin on Variable Stars |date=January 1999 |volume=4659 |bibcode=1999IBVS.4659....1K |url=https://ibvs.konkoly.hu/pub/ibvs/4601/4659.pdf |access-date=11 January 2025}}

{{cite journal|bibcode=2009A&A...498..961R|title=Catalogue of Ap, Hg Mn and Am stars|journal=Astronomy and Astrophysics|volume=498|issue=3|pages=961|last1=Renson|first1=P|last2=Manfroid|first2=J|year=2009|doi=10.1051/0004-6361/200810788|url=https://zenodo.org/record/890529|doi-access=free}}

{{cite journal|bibcode=2013AJ....145....3G|arxiv=1210.6360|title=Detection of Low-Mass-ratio Stellar Binary Systems|journal=The Astronomical Journal|volume=145|pages=3|last1=Gullikson|first1=Kevin|last2=Dodson-Robinson|first2=Sarah|year=2013|issue=1|doi=10.1088/0004-6256/145/1/3|s2cid=118517725}}

{{cite journal|bibcode=2015ApJ...804..146D|title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets|journal=The Astrophysical Journal|volume=804|issue=2|pages=146|last1=David|first1=Trevor J|last2=Hillenbrand|first2=Lynne A|year=2015|doi=10.1088/0004-637X/804/2/146|arxiv=1501.03154|s2cid=33401607}}

{{cite journal|bibcode=2014A&A...566A.132S|title=Accurate age determinations of several nearby open clusters containing magnetic Ap stars|journal=Astronomy & Astrophysics|volume=566|pages=A132|last1=Silaj|first1=J|last2=Landstreet|first2=J. D|year=2014|doi=10.1051/0004-6361/201321468|arxiv=1407.4531|s2cid=53370832}}

{{cite journal|bibcode=2017ARep...61...80S|title=General catalogue of variable stars: Version GCVS 5.1|journal=Astronomy Reports|volume=61|pages=80–88|last1=Samus'|first1=N. N|last2=Kazarovets|first2=E. V|last3=Durlevich|first3=O. V|last4=Kireeva|first4=N. N|last5=Pastukhova|first5=E. N|year=2017|issue=1|doi=10.1134/S1063772917010085|s2cid=125853869}}

{{cite journal|bibcode=1975mcts.book.....H|title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0|journal=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0|last1=Houk|first1=N|last2=Cowley|first2=A. P|year=1975}}

{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R|year=2002}}

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

{{cite journal|bibcode=2011MNRAS.410..190T|title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun|journal=Monthly Notices of the Royal Astronomical Society|volume=410|pages=190–200|last1=Tetzlaff|first1=N|last2=Neuhäuser|first2=R|last3=Hohle|first3=M. M|year=2011|issue=1|doi=10.1111/j.1365-2966.2010.17434.x|doi-access=free |arxiv=1007.4883|s2cid=118629873}}

{{cite journal

| title=Stellar parameters and H α line profile variability of Be stars in the BeSOS survey

| display-authors=1

| last1=Arcos | first1=C. | last2=Kanaan | first2=S.

| last3=Chávez | first3=J. | last4=Vanzi | first4=L.

| last5=Araya | first5=I. | last6=Curé | first6=M.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=474 | issue=4 | pages=5287–5299 | date=March 2018

| doi=10.1093/mnras/stx3075 | doi-access=free

| bibcode=2018MNRAS.474.5287A

| arxiv=1711.08675 | s2cid=74872624

}}