10 Draconis

{{Starbox begin

| name = 10 Draconis

}}

{{Starbox image

| image = 250px

| caption = A light curve for CU Draconis, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000

| constell = Draco

| ra = {{RA|13|51|25.90451}}

| dec = {{DEC|+64|43|23.7510}}

| appmag_v = 4.52 - 4.67

}}

{{Starbox character

| class = M3.5 III

| b-v = {{Val|1.572|0.010}}

| u-b =

| variable = LB:

}}

{{Starbox astrometry

| radial_v = {{Val|−12.26|0.17}}

| prop_mo_ra = +14.144

| prop_mo_dec = +3.172

| parallax = 8.2082

| p_error = 0.2628

| parallax_footnote =

| absmag_v = −0.70

}}

{{Starbox detail

| source =

| mass = {{Val|0.93|0.06}}

| radius = {{Val|83.22|2.08|2.16}}

| luminosity = {{Val|1031|70|fmt=commas}}

| gravity = 1.00

| temperature = {{Val|3584|35|fmt=commas}}

| metal_fe = −0.24

| rotational_velocity =

| age_gyr = {{Val|10.24|1.40}}

}}

{{Starbox catalog

| names = {{odlist | B=i Dra | F=10 Dra | V=CU Dra | BD=+65°963 | FK5=511 | HD=121130 | HIP=67627 | HR=5226 | SAO=16199 }}

}}

{{Starbox reference

| Simbad = 10+Dra

}}

10 Draconis is a single star in the northern circumpolar constellation of Draco. It was a latter designation of 87 Ursae Majoris, and is visible to the naked eye with an apparent visual magnitude of about 4.6. The distance to this star, as determined from its annual parallax shift of {{Val|8.2|ul=mas}}, is around 400 light years. It is moving closer with a heliocentric radial velocity of −12 km/s, and is expected to come to within {{Convert|25.82|pc|ly|sigfig=2|abbr=on|disp=out}} in about 8.6 million years.

Estimated to be around 10 billion years old, this is an aging red giant star with a stellar classification of M3.5 III. It is a periodic variable with a frequency of 11.98912 cycles per day and an amplitude of 0.0254 in magnitude. The spectrum does not show evidence of s-process enhancement. 10 Dra has 93% of the mass of the Sun but has expanded to about 83 times the Sun's radius. The star is radiating over 1,000 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,584 K.

References

{{reflist|refs=

{{cite web |title=Hipparcos Tools Interactive Data Access |url=https://www.cosmos.esa.int/web/hipparcos/interactive-data-access |website=Hipparcos |publisher=ESA |access-date=8 December 2021}}

{{cite web |title=GCVS Query=CU Dra |publisher=General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia |url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=CU+Dra |access-date=2023-04-19}}

{{cite journal

| last1=Koen | first1=Chris | last2=Eyer | first2=Laurent

| title=New periodic variables from the Hipparcos epoch photometry

| journal=Monthly Notices of the Royal Astronomical Society

| volume=331 | issue=1 | pages=45–59 | date=March 2002

| doi=10.1046/j.1365-8711.2002.05150.x | doi-access=free | bibcode=2002MNRAS.331...45K

| arxiv=astro-ph/0112194 | s2cid=10505995 }}

{{cite journal

| title=XHIP: An extended hipparcos compilation

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

| journal=Astronomy Letters

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

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

| arxiv=1108.4971 | s2cid=119257644 }}

{{cite journal

| last=Wagman | first=M.

| title=Flamsteed's Missing Stars

| journal=Journal for the History of Astronomy

| volume=18 | page=223 |date=August 1987

| issue=3

| bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305 | s2cid=118445625

}}

{{cite journal

| title=The Perkins catalog of revised MK types for the cooler stars

| journal=Astrophysical Journal Supplement Series

| volume=71 | page=245 | year=1989

| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.

| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}

{{cite journal

| title=Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer

| last1=Baines | first1=E. | last2=Schmitt | first2=H. R.

| journal=The Astronomical Journal

| volume=155 | issue=1 | date=December 2017

| page=30 | bibcode=2018AJ....155...30B | doi=10.3847/1538-3881/aa9d8b

| arxiv=1712.08109 | s2cid=119427037 | doi-access=free }}

{{cite journal

| title = A catalogue of multiplicity among bright stellar systems

| last1 = Eggleton | first1 = P. P. | last2 = Tokovinin | first2=A. A.

| journal = Monthly Notices of the Royal Astronomical Society

| volume = 389 | issue = 2 | page = 869 | date = 2008

| doi = 10.1111/j.1365-2966.2008.13596.x

| doi-access = free | bibcode = 2008MNRAS.389..869E |arxiv = 0806.2878 | s2cid = 14878976 }}

{{cite journal

| title=S stars without technetium - The binary star connection

| last1=Brown | first1=Jeffery A. | last2=Smith | first2=Verne V.

| last3=Lambert | first3=David L. | last4=Dutchover | first4=Edward Jr.

| last5=Hinkle | first5=Kenneth H. | last6=Johnson | first6=Hollis R.

| journal=Astronomical Journal | display-authors=1

| volume=99 | date=June 1990 | pages=1930–1940

| doi=10.1086/115475 | bibcode=1990AJ.....99.1930B }}

}}

Category:M-type giants

Category:Slow irregular variables

Category:Draco (constellation)

Draconis, i

Category:Durchmusterung objects