7 Arietis

{{Short description|Binary star system in the constellation Aries}}

{{Starbox observe

| epoch=J2000

| ra={{RA|01|55|51.03905}}

| dec={{DEC|+23|34|38.3509}}

| appmag_v=5.76

| constell=Aries

}}

{{Starbox character

| class=K1 III

| r-i =

| v-r =

| b-v = +1.185

| u-b = +1.04

| variable= Eclipsing binary
(disputed)

}}

{{Starbox astrometry

| radial_v=+15.95

| prop_mo_ra=+11.050

| prop_mo_dec=−9.513

| parallax=5.3941

| p_error=0.1720

| parallax_footnote =

| absmag_v=

}}

{{Starbox detail

| mass=

| radius={{val|25.0|0.9|1.4}}

| luminosity={{val|231.3|8.5}}

| temperature={{val|4500|130|78}}

| metal_fe=

| rotational_velocity={{val|1.8|1.0}}

| age_myr=

}}

{{Starbox catalog

| names = {{odlist | V=RR Arietis | F=7 Ari | BD=+22 284 | FK5=2130 | HD=11763 | HIP=8993 | HR=559 | SAO=75030 }}

}}

{{Starbox reference

| Simbad = 7+Ari

}}

7 Arietis is a binary star system in the northern constellation of Aries. 7 Arietis is the Flamsteed designation. The pair have a combined apparent visual magnitude of 5.76, making it faintly visible to the naked eye from dark suburban skies. Based upon an annual parallax shift of 5.39 mas, it is approximately {{Convert|600|ly|pc|abbr=off|lk=on}} distant from the Earth, give or take a 30 light-year margin of error. It is drifting further away from the Sun with a radial velocity of +16 km/s.

This is listed as an eclipsing binary system with a period of 47.9 days (although the star does not appear to be variable in the General Catalogue of Photometric Data, the Hipparcos data, and a study done in 1979-1980) It has the variable star designation RR Arietis. During each eclipse of the primary star, the magnitude of the system decreases by 0.40. The eclipse of the secondary reduces the magnitude by 0.35. The primary component of the system is an evolved giant star with a stellar classification of K1 III. It is about 25 times the size of the Sun and is radiating 231 times the Sun's luminosity from its photosphere at an eeffective temperature of 4,500 K.

The eclipsing binary nature of this star has been disputed by Italian astronomer Ennio Poretti. Observations made as part of the British Astronomical Association eclipsing binaries program by Tristram Brelstaff were also unable to confirm eclipses.

References

{{reflist|refs=

{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | s2cid=17804304 | postscript=. }}

{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{cite web |title=RR Ari |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=3692 |website=The International Variable Star Index |publisher=AAVSO |access-date=27 November 2024}}

{{cite journal |last1=Isles |first1=J. E. |title=Eclipsing Binaries, Andromeda To Camelopardalis, in 1972-1983 |journal=Journal of the British Astronomical Association |date=December 1985 |volume=96 |pages=27–32 |bibcode=1985JBAA...96...27I |url=https://articles.adsabs.harvard.edu/pdf/1985JBAA...96...27I |access-date=27 November 2024}}

{{citation | display-authors=1 | last1=Malkov | first1=O. Yu. | last2=Oblak | first2=E. | last3=Snegireva | first3=E. A. | last4=Torra | first4=J. | title=A catalogue of eclipsing variables | journal=Astronomy and Astrophysics | volume=446 | issue=2 | pages=785–789 |date=February 2006 | doi=10.1051/0004-6361:20053137 | bibcode=2006A&A...446..785M | postscript=. | doi-access=free | hdl=10995/73280 | hdl-access=free }}

{{citation | last1=Richichi |first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 |issue=2 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | postscript=. | doi-access=free }}

{{citation | display-authors=1 | last1=De Medeiros | first1=J. R. | last2=Udry | first2=S. | last3=Burki | first3=G. | last4=Mayor | first4=M. | title=A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars | journal=Astronomy and Astrophysics | volume=395 | pages=97–98 |date=November 2002 | doi=10.1051/0004-6361:20021214 | bibcode=2002A&A...395...97D | postscript=. | arxiv=1312.3474 }}

{{cite journal | title=Eclipsing Binaries, Andromeda To Camelopardalis, in 1972-1983 | last1=Isles | first1=J. E. | journal=Journal of the British Astronomical Association | volume=96 | pages=27–32 | year=1985 | bibcode=1985JBAA...96...27I }}

{{cite journal | title=RR Ari: Not a variable star | last1=Poretti | first1=Ennio | journal=Astrophysics and Space Science | volume=106 | pages=201–203 | year=1984 | issue=1 | bibcode=1984Ap&SS.106..201P | doi=10.1007/BF00653927 | s2cid=120037068 }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20559 HR 559]
[http://aladin.u-strasbg.fr/AladinPreview?-c=01+55+51.0397%2B23+34+38.358&ident=V*+RR+Ari&submit=Aladin+previewer Image 7 Arietis]

Category:K-type giants

Category:Eclipsing binaries

Category:Aries (constellation)

Category:Durchmusterung objects