Z Camelopardalis

{{Starbox image

| image = 250px

| caption = A visual band light curve for Z Camelopardalis, plotted from AAVSO data

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Camelopardalis

| ra = {{RA|08|25|13.199}}

| dec = {{DEC|+73|06|39.28}}

| appmag_v = 9.8 to 14.5

}}

{{Starbox character

| type =

| class = pec(UG)+G1

| b-v =

| u-b =

| variable = UGZ

}}

{{Starbox astrometry

| radial_v = {{val|-38.0}}

| prop_mo_ra = {{val|-9.003}}

| prop_mo_dec = {{val|-19.078}}

| parallax = 4.4369

| p_error = 0.0403

| parallax_footnote =

| absmag_v =

}}

{{Starbox catalog

| names = {{odlist | V=Z Cam | 2MASS=J08251318+7306391 }}, AAVSO 0814+73

}}

{{Starbox reference

| Simbad = Z+Cam

}}

Z Camelopardalis (Z Cam) is a cataclysmic variable star system in the northern constellation of Camelopardalis. It has an apparent visual magnitude which varies between 9.8 and 14.5. This system is the prototype star for the family of Z Camelopardalis variable stars: dwarf novae with standstills at a brightness intermediate between their maxima and minima. It may have been the "guest star" that was recorded by Chinese astrologers in the autumn of 77 BCE, but a 2024 study argues that this guest star was likely a comet, while one observed in 369 CE may have been Z Camelopardalis.

Z Camelopardalis was discovered photographically in 1904 by Henry Park Hollis during work for the Astrographic Catalogue. It is surrounded by an extensive shell thought to have been ejected in a nova explosion, the largest known of its type. The size and expansion of this shell sets a firm lower limit since the last eruption of at least 220 years.

Gallery

File:Z Camelopardalis light curve.png|Z Camelopardalis light curve showing a characteristic standstill interrupting the otherwise regular eruptions

File:Gas Shell Around Z Cam.jpg|Gas shell Around Z Camelopardalis

File:Z Camelopardalis GALEX.jpg|Z Camelopardalis in ultraviolet

References

{{reflist|refs=

{{cite web |title=Download Data |url=https://www.aavso.org/data-download |website=aavso.org |publisher=AAVSO |access-date=1 October 2021}}

{{cite simbad

| title=Z Cam | access-date=2020-11-15 | postscript=. }}

{{cite journal

| title=The Inter-eruption Timescale of Classical Novae from Expansion of the Z Camelopardalis Shell

| last1=Shara | first1=Michael M. | last2=Mizusawa | first2=Trisha

| last3=Zurek | first3=David | last4=Martin | first4=Christopher D.

| last5=Neill | first5=James D. | last6=Seibert | first6=Mark

| display-authors=1 | journal=The Astrophysical Journal

| arxiv=1205.3531 | bibcode=2012ApJ...756..107S

| doi=10.1088/0004-637X/756/2/107 | s2cid=37111481 }}

{{cite journal

| display-authors=1 | last1=Samus | first1=N. N.

| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

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

| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085

| s2cid=125853869 }}

{{cite journal

| last1=Shara | first1=Michael M. | last2=Martin | first2=Christopher D.

| last3=Seibert | first3=Mark | last4=Rich | first4=R. Michael

| last5=Salim | first5=Samir | last6=Reitzel | first6=David

| last7=Schiminovich | first7=David | last8=Deliyannis | first8=Constantine P.

| last9=Sarrazine | first9=Angela R. | last10=Kulkarni | first10=Shri R.

| last11=Ofek | first11=Eran O. | last12=Brosch | first12=Noah

| last13=Lépine | first13=Sebastien | last14=Zurek | first14=David

| last15=De Marco | first15=Orsola | last16=Jacoby | first16=George

| title=An ancient nova shell around the dwarf nova Z Camelopardalis

| display-authors=1 | journal=Nature

| volume=446 | issue=7132 | pages=159–162 | year=2007

| doi=10.1038/nature05576 | pmid=17344847

| bibcode=2007Natur.446..159S | s2cid=4428527 }}

{{cite journal

| title=New Variable Stars found on the Astrographic Plates at the Royal Observatory, Greenwich

| journal=Monthly Notices of the Royal Astronomical Society

| volume=64 | issue=9 | pages=837–838 | year=1904

| doi=10.1093/mnras/64.9.837 | doi-access=free

| bibcode=1904MNRAS..64..837. }}

{{cite journal

| display-authors=1 | last1=Duflot | first1=M.

| last2=Figon | first2=P. | last3=Meyssonnier | first3=N.

| title=Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue

| journal=Astronomy and Astrophysics Supplement Series

| volume=114 | pages=269 | year=1995

| bibcode=1995A&AS..114..269D }}

{{cite journal |last1=Yang |first1=Bo-Shun |last2=Hoffmann |first2=Susanne M. |date=December 2024 |title=Identification of Z Cam's Historical Counterpart: The Quest for an Ancient Nova |journal=Research in Astronomy and Astrophysics |volume=24 |issue=12 |pages=125004 |doi=10.1088/1674-4527/ad89aa |arxiv=2410.19010 |bibcode=2024RAA....24l5004Y}}

}}

External links

{{cite web

| title=Z Camelopardalis

| first=Aaron | last=Price

| date=April 1999 | publisher=AAVSO

| series=Variable Star of the Month

| url=http://www.aavso.org/vsots_zcam

| access-date=2020-11-16 }}

Category:G-type main-sequence stars

Category:Dwarf novae

Category:Camelopardalis

Camelopardalis, Z

J08251318+7306391