Lambda Arae

{{Starbox begin

| name = Lambda Arae

}}

{{Starbox image

| image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=λ Arae

|x=428|y=434

}}

|caption=Location of λ Arae (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|17|40|23.826}}

| dec = {{DEC|-49|24|56.10}}

| appmag_v = 4.77

| constell = Ara

}}

{{Starbox character

| class = F4 V

| r-i = +0.22

| v-r =

| b-v = +0.40

| u-b = −0.04

| variable = 3.10

}}

{{Starbox astrometry

| radial_v = +3.3{{±|0.3}}

| prop_mo_ra = +104.233

| prop_mo_dec = −175.956

| pm_footnote =

| parallax = 47.7045

| p_error = 0.1368

| parallax_footnote =

| absmag_v = +3.06

}}

{{Starbox detail

| mass = 1.37{{±|0.04}}

| radius = 1.711{{±|0.035}}

| luminosity = 4.69{{±|0.03|0.05}}

| temperature = 6,495{{±|3|7}}

| gravity = 4.064{{±|0.005|0.003}}

| metal_fe = −0.24

| rotational_velocity = 15.5

| age_gyr = 2.44{{±|0.39}}

}}

{{Starbox catalog

| names = {{odlist | B=λ Ara, λ Arae | CD=−49°11616 | GJ=686.2 | GJ2=9597 | HD=160032 | HIP=86486 | HR=6569 | NSV=23218 | NLTT=45187 | SAO=228257 | GC=23918 | PPM=323240 }}

}}

{{Starbox reference

| Simbad=lam+Ara

}}

Lambda Arae is a star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from λ Arae, and abbreviated Lambda Ara or λ Ara. The apparent visual magnitude of this star is 4.77, making it bright enough to be seen with the naked eye. Based on parallax measurements, it is located at a distance of {{Convert|68|ly|pc|abbr=off|lk=on}} from Earth. This star is drifting further away from the Sun with a radial velocity of +3 km/s.

The spectrum of this star matches a stellar classification of F4 V, which places it among the category of F-type main sequence stars. It is an estimated 2.4 billion years old, and is spinning with a projected rotational velocity of 15.5 km/s. This star has 40% more mass than the Sun and a 70% greater radius. It shines with 4.7 times the luminosity of the Sun. The outer atmosphere is radiating this energy at an effective temperature of 6,495 K, giving it the yellow-white hue of an F-type star. There is some evidence that this may be a binary star system consisting of two stars with identical masses.

Examination of Lambda Arae with the Spitzer Space Telescope shows an excess of infrared emission at a wavelength of 70 μm. This suggests it may be orbited by a disk of dust at a radius of more than 15 astronomical units

References

{{Reflist|30em|refs=

{{citation | postscript=.

| last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar

| title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?

| journal=Astronomy & Astrophysics | arxiv=1204.2459

| volume=542 | page=A116 | date=June 2012

| doi=10.1051/0004-6361/201118724 | bibcode=2012A&A...542A.116A | s2cid=53666672 }}

{{citation | display-authors=1 | 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. | 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 | issue=1 | pages=161–170 |date=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}

{{citation | display-authors=1 | last1=Holmberg | first1=J. | last2=Nordstrom | first2=B. | last3=Andersen | first3=J. | title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | journal=Astronomy and Astrophysics | volume=501 | issue=3 |date=July 2009 | pages=941–947 | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H | postscript=. |arxiv = 0811.3982 | s2cid=118577511 }}

{{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

{{citation | display-authors=1 | last1=Fuhrmann | first1=K. | last2=Chini | first2=R. | last3=Hoffmeister | first3=V. H. | last4=Stahl | first4=O. | title=Evidence for the nearby F4V star λ Ara as a binary system | journal=Monthly Notices of the Royal Astronomical Society | volume=415 | issue=2 | pages=1240–1243 |date=August 2011 | doi=10.1111/j.1365-2966.2011.18764.x | bibcode=2011MNRAS.415.1240F | postscript=. | doi-access=free }}

{{cite simbad | title=lam Ara | accessdate=2010-07-30 | mode=cs2 | postscript=. }}

{{citation | postscript=. | display-authors=1 | last1=Lawler | first1=S. M. | last2=Beichman | first2=C. A. | last3=Bryden | first3=G. | last4=Ciardi | first4=D. R. | last5=Tanner | first5=A. M. | last6=Su | first6=K. Y. L. | last7=Stapelfeldt | first7=K. R. | last8=Lisse | first8=C. M. | last9=Harker | first9=D. E. | title=Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars | journal=The Astrophysical Journal | volume=705 | issue=1 | pages=89–111 |date=November 2009 | doi=10.1088/0004-637X/705/1/89 | bibcode=2009ApJ...705...89L |arxiv = 0909.0058 | s2cid=1272803 }}

{{citation | postscript=.

| title=Pulkovo compilation of radial velocities for 35495 stars in a common system

| last=Gontcharov | first=G. A.

| journal=Astronomy Letters

| date=2006 | volume=32 | issue=11 | pages=759–771

| doi=10.1134/S1063773706110065 | arxiv=1606.08053

| bibcode=2006AstL...32..759G | s2cid=119231169 }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%206569 HR 6569]
[http://aladin.u-strasbg.fr/AladinPreview?-c=17+40+23.8258-49+24+56.112&ident=NSV+23218&submit=Aladin+previewer Image Lambda Arae]

Category:F-type main-sequence stars

Category:Circumstellar disks

Category:Ara (constellation)

Arae, Lambda

6569

Category:Durchmusterung objects

9597

160032

086486