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7 Ceti

{{Short description|Star in the constellation Cetus}}

{{Starbox begin

| title = 7 Ceti

}}

{{Starbox image

| image = 250px

| caption = A light curve for AE Ceti, plotted from data presented by Tabur, et al. (2009)

}}

{{Starbox observe

| epoch = J2000

| constell = Cetus

| ra = {{RA|00|14|38.41655}}

| dec = {{DEC|−18|55|58.3145}}

| appmag_v = 4.44 {{nowrap|(4.26–4.46)}}

}}

{{Starbox character

| class = M1 III

| b-v = {{Val|1.640|0.044}}

| u-b =

| variable = LB:

}}

{{Starbox astrometry

| radial_v = {{Val|−22.9|1.0}}

| prop_mo_ra = −26.15

| prop_mo_dec = −73.58

| parallax = 7.29

| p_error = 0.28

| parallax_footnote =

| absmag_v = –1.24

}}

{{Starbox detail

| mass =

| radius = 54

| temperature = 3,800

| luminosity = 1019.14

| gravity =

| metal_fe =

| rotational_velocity =

| age_myr =

}}

{{Starbox catalog

| names={{odlist | V=AE Ceti | F=3 Cet | BD=−19°21 | FK5= | HD=1038 | HIP=1170 | HR=48 | SAO=147169 }}

}}

{{Starbox reference

| Simbad=7+Cet

}}

{{Starbox end}}

7 Ceti is a single, variable star in the equatorial constellation of Cetus. It has the variable star designation AE Ceti. The star is visible to the naked eye with a baseline apparent visual magnitude of 4.44. Based upon an annual parallax shift of only {{Val|7.3|u=mas}}, it is located roughly 450 light years away. It is moving closer to the Sun with a heliocentric radial velocity of −23 km/s. Eggen (1965) listed it as a probable member of the Wolf 630 group of co-moving stars.

This is an aging red giant star with a stellar classification of M1 III, currently on the asymptotic giant branch. In 1959, Alan William James Cousins announced the detection of variability in the brightness of 7 Ceti. It was given its variable star designation in 1973. Samus et al. (2017) has it classed as a slow irregular variable of type LB:, and ranges in magnitude from 4.26 down to 4.46. Tabur et al. (2009) list it as a semiregular variable with four known periods ranging in frequency from 19.2 to 41.7 days. The stellar atmosphere of 7 Ceti has expanded to an estimated 54 times the Sun's radius. It is radiating around 1,019 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,800 K.

class="wikitable" style="text-align:center;"

|+ Luminosity variation

! Period
(Days)

! Amplitude
(Mag.)

19.20.018
19.60.020
27.10.018
41.70.017

References

{{reflist|refs=

{{cite simbad | title=7 Cet | access-date=December 26, 2018 }}

{{cite journal

| last1=Cousins | first1=A. W. J. | title=Measures of Bright Southern Stars on UBV System

| bibcode=1959MNSSA..18...46C | journal=Monthly Notes of the Astronomical Society of South Africa

| date=1959 | volume=18 | pages=46-47 | url=https://articles.adsabs.harvard.edu/pdf/1959MNSSA..18...46C

| access-date=24 January 2025}}

{{cite journal

| last1=Kukarkin | first1=B. V. | last2=Kholopov | first2=P. N. | last3=Kukarkina | first3=N. P. | last4=Perova | first4=N. B.

| title=59th Name-List of Variable Stars | journal=Information Bulletin on Variable Stars | date=October 1973 | volume=834

| pages=1-22 | bibcode=1973IBVS..834....1K | url=https://ibvs.konkoly.hu/pub/ibvs/0801/0834.pdf

| access-date=24 January 2025}}

{{citation

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| last5=Pastukhova | first5=E. N. | display-authors=1

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

| year=2017 | volume=61 | issue=1 | pages=80–88

| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 | postscript=. }}

{{citation

| title=Asymptotic giant branch stars near the sun

| last1=Eggen | first1=O. J.

| journal=The Astronomical Journal

| volume=104| pages=275 | year=1992

| bibcode=1992AJ....104..275E | doi=10.1086/116239

| postscript=. }}

{{citation

| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.

| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project

| journal=Astronomy & Astrophysics

| volume=546 | id=A61 | pages=14 | date=October 2012

| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D

| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

{{citation

| title=The Wolf 630 group

| last1=Eggen | first1=O. J.

| journal=The Observatory

| volume=85 | pages=191–195 | date=October 1965

| bibcode=1965Obs....85..191E | 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=. }}

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

| last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=4 | location=Ann Arbor | year=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1988mcts.book.....H | postscript=. }}

{{citation | display-authors=1

| last1=Tabur | first1=V. | last2=Bedding | first2=T. R.

| last3=Kiss | first3=L. L. | last4=Moon | first4=T. T.

| last5=Szeidl | first5=B. | last6=Kjeldsen | first6=H.

| title=Long-term photometry and periods for 261 nearby pulsating M giants

| journal=Monthly Notices of the Royal Astronomical Society

| volume=400 | issue=4 | pages=1945–1961 | date=December 2009

| doi=10.1111/j.1365-2966.2009.15588.x | doi-access=free | bibcode=2009MNRAS.400.1945T

| arxiv=0908.3228 | s2cid=15358380 | postscript=. }}

{{citation | display-authors=1

| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L.

| last3=Covino | first3=S. | last4=Pozzi | first4=A.

| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)

| edition=Third | journal=Astronomy and Astrophysics

| volume=367 | issue=2 | pages=521–524 | date=February 2001

| doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P

| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}

{{citation

| display-authors=1 | last1=McDonald | first1=I.

| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L.

| title=Fundamental parameters and infrared excesses of Hipparcos stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=427 | pages=343–357 | year=2012

| issue=1 | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | bibcode=2012MNRAS.427..343M

| arxiv=1208.2037 | s2cid=118665352 | postscript=. }}

{{citation

| 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 | postscript=. }}

}}

{{Stars of Cetus}}

{{DEFAULTSORT:7 Ceti}}

Category:M-type giants

Category:Slow irregular variables

Category:Semiregular variable stars

Category:Cetus

Ceti, 07

Category:Durchmusterung objects

001038

001170

0048

Ceti, AE