NGC 752

{{Short description|Open cluster in the constellation Andromeda}}

{{Infobox cluster

| image =File:NGC_752.png

| caption = NGC 752

| credit =

| name = NGC 752

| constellation = Andromeda

| type =

| epoch = J2000

| ra = {{RA|01|57|41}}{{cite simbad|title=NGC 752|access-date=10 February 2018}}

| dec = {{DEC|+37|47.1}}

| dist_ly = 1,470 ly{{cite conference |bibcode=2022csss.confE..82G |title=Open cluster NGC752: Revision by GAIA EDR3 data |last1=Gaysin |first1=Renat |last2=Hojaev |first2=Alisher |journal=Cambridge Workshop on Cool Stars |year=2022 |page=82 |doi=10.5281/zenodo.7481659 }}

| dist_pc = 450 pc

| appmag_v = 5.7{{cite book | last = Dunlop | first = Storm | author-link = Storm Dunlop | title = Atlas of the Night Sky | url = https://archive.org/details/collinsatlasofni0000dunl | url-access = registration | publisher = Collins | year = 2005 | isbn = 978-0-00-717223-8}}

| size_v = 75{{prime}}

| radius_ly =

| absmag_v =

| constellation name = Andromeda

| notes =

| names = Caldwell 28, Cr 23

}}

File:NGC 752 map.png

NGC 752 (also known as Caldwell 28) is an open cluster in the constellation Andromeda. The cluster was discovered by Caroline Herschel in 1783 and cataloged by her brother William Herschel in 1786, although an object that may have been NGC 752 was described by Giovanni Batista Hodierna before 1654.{{cite web|url=http://cseligman.com/text/atlas/ngc7a.htm#752|title=New General Catalogue objects: NGC 750 - 759|author=Seligman, Courtney|website=cseligman.com|access-date=10 February 2018}}

The large cluster lies 1,400 light-years away from the Earth and is easily seen through binoculars, although it may approach naked eye visibility under good observing conditions. A telescope reveals about 60 stars no brighter than 9th magnitude within NGC 752.Frommert, Kronberg, [http://messier.seds.org/xtra/ngc/n0752.html SEDS: NGC 752]

Components

The most up-to-date research lists 302 stars as members of NGC 752. Since the age of the cluster is {{val|1.34|0.06|ul=Gyr}}, they are mainly low mass stars on the main sequence or red giants, with a main sequence turnoff at about F0. A blue straggler star is also present, along with some spectroscopic binaries and variable stars. The detached eclipsing binary DS Andromedae is a member of this cluster.{{cite journal|arxiv=2210.11649|doi=10.3847/1538-3881/ac9c59 |title=Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752 |year=2023 |last1=Sandquist |first1=Eric L. |last2=Buckner |first2=Andrew J. |last3=Shetrone |first3=Matthew D. |last4=Barden |first4=Samuel C. |last5=Pilachowski |first5=Catherine A. |last6=Deliyannis |first6=Constantine P. |last7=Harmer |first7=Dianne |last8=Mathieu |first8=Robert |last9=Meibom |first9=Søren |last10=Frandsen |first10=Søren |last11=Orosz |first11=Jerome A. |journal=The Astronomical Journal |volume=165 |issue=1 |page=6 |bibcode=2023AJ....165....6S |s2cid=253080539 |doi-access=free }}

Images

File:Stack 15frames 675s.png

=Notable stars=

border="0" cellpadding="6" cellspacing="1" style="margin-right:0.4em; background:#CDC9C9;" ! colspan="1" \| Name	Right ascension	Declination	Apparent magnitude (V)	Spectral type	Database references	Relevance
bgcolor="#FFFAFA" \| TYC 2816-327-1	01^h 56^m 08.9572^s	+37° 39' 52.7528"	10.41	F5.3V	[http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=TYC+2816-327-1 Simbad]	Gamma Doradus variable
bgcolor="#FFFAFA" \| DS Andromedae	01^h 57^m 46.0561^s	+38° 04' 28.43112"	10.44 - 10.93 (variable)	F3IV-V + G0V (double)	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=DS+And Simbad]	Beta Lyrae variable
bgcolor="#FFFAFA" \| BD+37 416	01^h 56^m 10.3002^s	+37° 45' 00.0301"	10.00	F2III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+416 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+37 416B	01^h 56^m 11.1020^s	+37° 45' 11.3889"	11.19	F0	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+416B Simbad]	Candidate companion of BD+37 416
bgcolor="#FFFAFA" \| TYC 2816-1390-1	01^h 56^m 12.8772^s	+38° 01' 43.1869"	10.88	F3V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=TYC+2816-1390-1 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| TYC 2319-568-1	01^h 56^m 57.5899^s	+37° 23' 20.6538"	10.6	F2V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=TYC+2319-568-1 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| 2MASS J01571216+3756048	01^h 57^m 12.1584^s	+37° 56' 04.7909"	11.9	G5.0V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J01571216%2B3756048 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+36 364	01^h 57^m 25.9968^s	+37° 43' 19.6966"	10.4	F2III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B36+364 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| QX Andromedae	01^h 57^m 57.7818^s	+37° 48' 22.4500"	11.28 - 11.50 (variable)	F5	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=QX+Andromedae Simbad]	W Ursae Majoris variable
bgcolor="#FFFAFA" \| 2MASS J01575883+3741269	01^h 57^m 58.8386^s	+37° 41' 26.9575"	12.31	F8	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J01575883%2B3741269 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| TYC 2816-691-1	01^h 58^m 16.8604^s	+37° 38' 15.9955"	11.21	F5V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=TYC+2816-691-1 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| V447 Andromedae	01^h 58^m 53.9322^s	+37° 34' 42.5263"	13.39	K3.0	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=V447+And Simbad]	RS Canum Venaticorum variable
bgcolor="#FFFAFA" \| BD+36 348	01^h 55^m 27.6831^s	+37° 34' 04.6482"	10.14	F2V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B36+348 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+37 410	01^h 55^m 29.2926^s	+37° 50' 26.3171"	9.94	F4III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+410 Simbad]	Eclipsing binary
bgcolor="#FFFAFA" \| BD+37 418	01^h 56^m 18.8954^s	+37° 58' 00.4602"	8.97	G9III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+418 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| HD 11812	01^h 56^m 49.7623^s	+38° 01' 21.6883"	9.13	F3V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+11812 Simbad]	In the HD catalogue
bgcolor="#FFFAFA" \| HD 11811	01^h 56^m 50.4330^s	+38° 01' 58.1400"	8.91	G2V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+11811 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+37 431	01^h 57^m 36.2116^s	+37° 45' 10.1549"	9.85	F2III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+431 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+36 367	01^h 57^m 37.3494^s	+37° 29' 27.6181"	9.75	A0III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B36+367 Simbad]	Blue straggler
bgcolor="#FFFAFA" \| BD+36 368	01^h 57^m 37.5965^s	+37° 39' 37.9032"	8.85	K1III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B36+368 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+37 439	01^h 57^m 59.3462^s	+37° 54' 53.9679"	9.85	F2III	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+439 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| BD+37 444	01^h 58^m 36.8870^s	+37° 45' 10.7241"	9.62	F2V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B37+444 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| TYC 2816-771-1	01^h 58^m 40.0620^s	+37° 38' 05.2030"	12.43	F2V	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=TYC+2816-771-1 Simbad]	Spectroscopic binary
bgcolor="#FFFAFA" \| 2MASS J01591990+3723230	01^h 59^m 19.8967^s	+37° 23' 23.0364"	12.893	–	[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J01591990%2B3723230 Simbad]	Spectroscopic binary

References

{{Reflist| refs=

{{cite journal |title=A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-mass Stars in the 1.3 Gyr Old Open Cluster NGC 752 |journal=The Astrophysical Journal | last1=Agüeros |first1=M. A. | last2= Bowsher |first2=E. C. |last3=Bochanski |first3=J. J. |last4=Cargile |first4=P. A. |last5=Covey |first5=K. R. |last6=Douglas |first6=S. T. |last7=Kraus |first7=A. |last8=Kundert |first8=A. |last9=Law |first9=N. M. |last10=Ahmadi |first10=A. |last11=Arce |first11=H. G. |volume=862 |issue=1 |pages=33 |date=July 2018 |bibcode=2018ApJ...862...33A|doi=10.3847/1538-4357/aac6ed |arxiv=1804.02016 |s2cid=119438236 |doi-access=free }}

{{cite journal |title=Soft X-rays from the intermediate-age open cluster NGC 752 |journal=Astronomy and Astrophysics | last1=Belloni |first1=T. | last2=Verbunt |first2=F. |volume=305 |pages=806 |date=January 1996 |bibcode=1996A&A...305..806B}}

}}

External links

[http://messier.seds.org/xtra/ngc/n0752.html SEDS] – NGC 752
[http://www.perseus.gr/Astro-DSO-NGC-0752.htm perseus.gr] – NGC 752 in a hires LRGB CCD image
{{WikiSky}}

Category:Open clusters

Category:Andromeda (constellation)

0752

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Category:Discoveries by Caroline Herschel