Delta Lupi

{{Starbox begin

| name = δ Lupi

}}

{{Starbox image

| image=

{{Location mark

|image=Lupus constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=δ Lup

|x=472|y=657

}}

|caption=Location of δ Lupi (circled)

}}

{{Starbox observe

| epoch = J2000.0

| ra = {{RA|15|21|22.32168}}

| dec = {{DEC|-40|38|51.0738}}

| appmag_v = 3.20 - 3.24

| constell = Lupus

}}

{{Starbox character

| class = B1.5 IV

| b-v = −0.224

| u-b = −0.910

| variable = β Cep

}}

{{Starbox astrometry

| radial_v = +0.2

| prop_mo_ra = −19.49

| prop_mo_dec = −25.29

| parallax = 3.69

| p_error = 0.54

| parallax_footnote =

| absmag_v = −3.1

}}

{{Starbox detail

| mass = {{val|11.9|0.2}}

| radius = 6.1

| luminosity = 10,000

| temperature = 22,908

| metal_fe = {{val|-0.25|0.11}}

| gravity = 3.86

| rotational_velocity = 230

| age_myr = {{val|15.4|1.3}}

}}

{{Starbox catalog

| names = CD−40°9538, FK5 1402, HD 136298, HIP 75141, HR 5695, SAO 225691, UBV 13201

}}

{{Starbox reference

| Simbad=del+Lup

}}

Delta Lupi (δ Lupi, δ Lup) is a star in the southern circumpolar constellation of Lupus. In traditional Chinese astronomy, it is "the 2nd (star) of the Cavalry Officer" (騎官二). With an apparent visual magnitude of 3.2, it is the fourth-brightest star in the constellation. The distance to this star has been measured using the parallax technique, yielding an estimate of roughly 900 light-years with a 15% margin of error.

File:DeltaLupLightCurve.png for Delta Lupi, plotted from TESS data]]

The spectrum of this star matches a stellar classification of B1.5 IV, which indicates this star has entered the subgiant stage and is in the process of evolving into a giant star. It is radiating around 10,000 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 23,000 K, giving it a blue-white hue. This star has nearly 12 times the mass of the Sun and is roughly 15 million years old.

Delta Lupi is a Beta Cephei variable star that undergoes periodic pulsations. It has a single period of variability lasting 0.1655 days, or six cycles per day. This is a proper motion member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.

References

{{Reflist|refs=

{{cite journal |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. |title=General catalogue of variable stars: Version GCVS 5.1 |journal=Astronomy Reports |date=January 2017 |volume=61 |issue=1 |pages=80–88 |doi=10.1134/S1063772917010085 |issn=1063-7729 |bibcode=2017ARep...61...80S|s2cid=255195566 }}

{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=11 December 2022}}

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

{{citation | last1=de Geus | first1=E. J. | last2=de Zeeuw | first2=P. T. | last3=Lub | first3=J. | title=Physical parameters of stars in the Scorpio-Centaurus OB association | journal=Astronomy and Astrophysics | volume=216 | issue=1–2 | pages=44–61 |date=June 1989 | bibcode=1989A&A...216...44D }}

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

{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 |date=November 1979 | issue=3 | bibcode=1979MNRAS.189..601U | doi=10.1093/mnras/189.3.601| doi-access=free }}

{{citation | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK spectral types for bright southern OB stars | journal=Astrophysical Journal | volume=157 | page=313 |date=July 1969 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H | doi-access=free }}

{{cite conference | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | title=The Revision of the General Catalogue of Radial Velocities | volume=30 | page=57 | conference=IAU Symposium no. 30 | book-title=Determination of Radial Velocities and their Applications | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}

{{cite journal | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | date=1970 | page=1 | bibcode=1970CoAsi.239....1B }}

{{citation | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=Hugo | title=A photometric investigation of the Scorpio-Centaurus association | journal=Astrophysical Journal Supplement | volume=15 | page=459 |date=June 1968 | bibcode=1968ApJS...15..459G | doi=10.1086/190168 | doi-access=free }}

{{citation | last1=Smolec | first1=R. | last2=Moskalik | first2=P. | title=Amplitude saturation in β Cephei models | journal=Monthly Notices of the Royal Astronomical Society | volume=377 | issue=2 | pages=645–656 |date=May 2007 | doi=10.1111/j.1365-2966.2007.11620.x | doi-access=free | bibcode=2007MNRAS.377..645S |arxiv = astro-ph/0702406 | s2cid=17908442 }}

{{citation | last1=Niemczura | first1=E. | last2=Daszyńska-Daszkiewicz | first2=J. | title=Metallicities of the β Cephei stars from low-resolution ultraviolet spectra | journal=Astronomy and Astrophysics | volume=433 | issue=2 | pages=659–669 |date=April 2005 | doi=10.1051/0004-6361:20040396 | bibcode=2005A&A...433..659N |arxiv = astro-ph/0410440 | s2cid=14295631 }}. Note: value taken from [m/H].

}}

Lupi, Delta

Category:Lupus (constellation)

Category:Beta Cephei variables

Category:B-type subgiants

Category:Upper Centaurus Lupus

Delta Lupi

See also

References