49 Cancri

{{Starbox image

| image=

{{Location mark

|image=Cancer constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=49 Cancri

|x=480|y=720

}}

|caption=Location of 49 Cancri (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cancer

| ra = {{RA|08|44|45.03571}}

| dec = {{DEC|+10|04|54.0073}}

| appmag_v = 5.58 - 5.71

}}

{{Starbox character

| type = Main sequence

| class = A1VpHgMnSiEu

| b-v = −0.069

| u-b =

| variable = α² CVn

}}

{{Starbox astrometry

| radial_v = +27.50

| prop_mo_ra = −14.686

| prop_mo_dec = −18.466

| parallax = 6.5062

| p_error = 0.0748

| parallax_footnote =

| absmag_v = +0.07

}}

{{Starbox detail

| mass = 3.011

| radius = 2.909

| luminosity = 102

| temperature = 10,615

| gravity = 3.964

| metal_fe = +0.013

| rotation = {{val|6.907|ul=days}}

| rotational_velocity = 21

| age_myr = 263

}}

{{Starbox catalog

| names = {{odlist | B=b Cnc | F=49 Cnc | V=BI Cnc | BD=+10°1864 | FK5=2688 | HD=74521 | HIP=42917 | HR=3465 | SAO=98089 }}

}}

{{Starbox reference

| Simbad = 49+Cnc

}}

49 Cancri is a single star in the zodiac constellation of Cancer, located 501 light years away from the Sun. It has the Bayer designation b Cancri; 49 Cancri is the Flamsteed designation. It is visible to the naked eye as a faint star with an apparent visual magnitude of about 5.6. It is moving away from the Earth with a heliocentric radial velocity of +27.5 km/s.

File:BICncLightCurve.png for BI Cancri, plotted from TESS data]]

In 1962, Helmut Abt and John C. Golson published a paper that showed that 49 Cancri was probably a variable star. It was given its variable star designation, BI Cancri, in 1962. Its brightness changes from magnitude 5.58 to 5.71 every seven days. It is classified as an α² Canum Venaticorum variable, a class of magnetic chemically peculiar stars. The brightness changes are thought to correspond to the rotation of the star. 49 Cancri is classified from its spectrum as an Ap star, with enhanced lines of silicon, europium, and chromium. Additionally, calcium and magnesium lines are described as weaker than normal.

49 Cancri is classified as an A1 main sequence star. It has three times the mass of the Sun, an effective temperature of {{val|10615|fmt=commas|ul=K}}, and a radius of {{solar radius|2.9|link=y}}. It radiates about a hundred times the luminosity of the Sun due to its high temperature and large size.

References

{{Reflist|refs=

{{cite journal

| title=57th Name-List of Variable Stars | journal=Information Bulletin on Variable Stars

| date=October 1970 | volume=480 | pages=1–39 | bibcode=1970IBVS..480....1K

| url=https://articles.adsabs.harvard.edu/pdf/1970IBVS..480....1K | access-date=30 December 2024}}

{{cite journal

| last1=Abt | first1=Helmut A. | last2=Golson | first2=John C.

| title=Colors and Variability of Magnetic Stars | journal=Astrophysical Journal

| url=https://articles.adsabs.harvard.edu/pdf/1962ApJ...136...35A | access-date=30 December 2024}}

{{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=7 January 2023}}

{{cite journal

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters | arxiv=1108.4971

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644 }}

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

{{cite journal |bibcode=1995ApJS...99..135A |title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars |journal=The Astrophysical Journal Supplement Series |volume=99 |pages=135 |last1=Abt |first1=Helmut A. |last2=Morrell |first2=Nidia I. |year=1995 |doi=10.1086/192182 |doi-access=free }}

{{cite journal |bibcode=2006AstL...32..759G |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |volume=32 |issue=11 |pages=759–771 |last1=Gontcharov |first1=G. A. |year=2006 |arxiv=1606.08053 |doi=10.1134/S1063773706110065 |s2cid=119231169 }}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal |bibcode=2016ApJS..224....2H |title=The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8 |journal=The Astrophysical Journal Supplement Series |volume=224 |issue=1 |pages=2 |last1=Huber |first1=Daniel |last2=Bryson |first2=Stephen T. |last3=Haas |first3=Michael R. |last4=Barclay |first4=Thomas |last5=Barentsen |first5=Geert |last6=Howell |first6=Steve B. |last7=Sharma |first7=Sanjib |last8=Stello |first8=Dennis |last9=Thompson |first9=Susan E. |year=2016 |arxiv=1512.02643 |doi=10.3847/0067-0049/224/1/2 |s2cid=118621218 |doi-access=free }}

{{cite journal |bibcode=2017MNRAS.468.2745N |title=An investigation of the rotational properties of magnetic chemically peculiar stars |journal=Monthly Notices of the Royal Astronomical Society |volume=468 |issue=3 |pages=2745 |last1=Netopil |first1=Martin |last2=Paunzen |first2=Ernst |last3=Hümmerich |first3=Stefan |last4=Bernhard |first4=Klaus |year=2017 |arxiv=1703.05218 |doi=10.1093/mnras/stx674 |doi-access=free |s2cid=119215348 }}

{{cite journal |bibcode=2009A&A...498..961R |title=Catalogue of Ap, HGMN 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 |doi-access=free }}

{{cite journal |bibcode=2006A&A...450..763K |title=Evolutionary state of magnetic chemically peculiar stars |journal=Astronomy and Astrophysics |volume=450 |issue=2 |pages=763 |last1=Kochukhov |first1=O. |last2=Bagnulo |first2=S. |year=2006 |arxiv=astro-ph/0601461 |doi=10.1051/0004-6361:20054596 |s2cid=18596834 }}

}}

Category:A-type main-sequence stars

Category:Ap stars

Category:Cancer (constellation)

Category:Alpha2 Canum Venaticorum variables

Cancri, BI