HD 106112

{{short description|Dwarf star in the constellation Camelopardalis}}

{{Starbox begin

|name=HD 106112 }}

{{Starbox image

| image = 250px

| caption = A visual band light curve for HD 106112, adapted from Steinbring et al. (1995)

}}

{{Starbox observe

|constell=Camelopardalis

|epoch=J2000

| ra = {{RA|12|12|11.94409}}{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | 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}}

| dec = {{DEC|+77|36|58.4696}}

|appmag_v=5.155{{cite simbad|title=iot Del|access-date=15 January 2016}} }}

{{Starbox character

|class=kA6hF0mF0 (III){{cite journal|bibcode=2003AJ....126.2048G|title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I|journal=The Astronomical Journal|volume=126|issue=4|pages=2048|last1=Gray|first1=R. O.|last2=Corbally|first2=C. J.|last3=Garrison|first3=R. F.|last4=McFadden|first4=M. T.|last5=Robinson|first5=P. E.|year=2003|doi=10.1086/378365|arxiv = astro-ph/0308182 |s2cid=119417105}}

|b-v=+0.31{{cite journal| author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1| date=1986|bibcode= 1986EgUBV........0M }}

|u-b=+0.10

|variable=Ellipsoidal

}}

{{Starbox astrometry

|radial_v=0.40

|prop_mo_ra=11.40

|prop_mo_dec=20.20

|parallax=29.96

|p_error=0.24

|parallax_footnote=

|absmag_v=1.62{{cite journal|title=Abundance analysis of Am binaries and search for tidally driven abundance anomalies - III. HD 116657, HD 138213, HD 155375, HD 159560, HD 196544 and HD 204188|journal=Monthly Notices of the Royal Astronomical Society|volume=420|issue=2|pages=1207–1216|date=2012|bibcode=2012MNRAS.420.1207S|doi=10.1111/j.1365-2966.2011.20108.x|arxiv=1111.0978|last1=Stateva|first1=I.|last2=Iliev|first2=I. Kh.|last3=Budaj|first3=J.|doi-access=free |s2cid=118574727 }}

}}

{{Starbox orbit

|reference={{cite journal|title=S_B⁹: The ninth catalogue of spectroscopic binary orbits|display-authors=1|author1=Pourbaix, D.|author2=Tokovinin, A. A.|author3=Batten, A. H.|author4=Fekel, F. C.|author5=Hartkopf, W. I.|author6=Levato, H.|author7=Morrell, N. I.|author8=Torres, G.|author9=Udry, S.|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|year=2004|doi=10.1051/0004-6361:20041213|arxiv=astro-ph/0406573|bibcode=2004A&A...424..727P|s2cid=119387088}}

|period_unitless=1.271 days

|eccentricity=0.01

|periarg=163

|periastron=2436763.91

|k1=64.00

}}

{{Starbox detail

|source=

|component1=A

|mass=

|temperature=7,122{{citation | last1=Schröder | first1=C. | last2=Reiners | first2=Ansgar | last3=Schmitt | first3=Jürgen H. M. M. | title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | bibcode=2009A&A...493.1099S | doi-access=free | url=http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2 }}{{Dead link|date=September 2023 |bot=InternetArchiveBot |fix-attempted=yes }}

|radius=

|gravity=3.98

|luminosity=8.02{{cite journal|bibcode=2012MNRAS.427..343M|title=Fundamental parameters and infrared excesses of Hipparcos stars|journal=Monthly Notices of the Royal Astronomical Society|volume=427|pages=343–357|last1=McDonald|first1=I.|last2=Zijlstra|first2=A. A.|last3=Boyer|first3=M. L.|year=2012|issue=1|doi=10.1111/j.1365-2966.2012.21873.x|doi-access=free |arxiv = 1208.2037 |s2cid=118665352}}

|rotational_velocity=64.1

}}

{{Starbox catalog

|names=CO Cam, BD+78°412, HD 106112, HIP 59504, SAO 7522, HR 4646, GC 16672}}

{{Starbox reference

|Simbad=CO+Cam }}

{{Starbox end}}

HD 106112, also known as CO Camelopardalis, is a star in the constellation Camelopardalis. It has an apparent magnitude of about 5.1, meaning that it is just barely visible to the naked eye. Based upon parallax measurements made by the Hipparcos spacecraft, this star is around 177 light years away from the Sun.

HD 106112's spectral type shows that it is an A-type giant star.{{cite web |last1=Allen |first1=J. S. |title=The Classification of Stellar Spectra |website=UCL Department of Physics and Astronomy: Astrophysics Group |url=http://www.star.ucl.ac.uk/~pac/spectral_classification.html |access-date=1 January 2014}} HD 106112 is also an Am star, also known as a metallic-line star. These types of stars have spectra indicating varying amounts of metals, like iron.{{cite web|url=http://www.daviddarling.info/encyclopedia/A/Am_star.html|title=Am star, The Internet Encyclopedia of Science|author=David Darling|access-date=14 August 2008|archive-date=4 August 2017|archive-url=https://web.archive.org/web/20170804053755/http://www.daviddarling.info/encyclopedia/A/Am_star.html|url-status=dead}}

Observations of the stars spectrum reveal a periodic Doppler shift. This means that HD 106112 is a spectroscopic binary with a period of 1.271 days and an eccentricity of 0.01. Eric Steinbring et al. discovered that the star is a variable star, in 1995. It was given its variable star designation, CO Camelopardalis, in 1997. The two stars orbit so closely that they distort each other into an ellipsoidal shape through gravity, thereby forming a rotating ellipsoidal variable system. However, almost no information is known about the companion star.