NGC 752

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.[2]

NGC 752
NGC 752
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	01^h 57^m 41^s[1]
Declination	+37° 47.1′[1]
Distance	1,300 ly[2] (400 pc)
Apparent magnitude (V)	5.7[3]
Apparent dimensions (V)	75′
Physical characteristics
Other designations	Caldwell 28, Cr 23

Map showing the location of NGC 752

The large cluster lies 1,300 light-years away from the Earth[2] 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.[3][4]

Components

The most up-to-date research lists 258 stars as members of this cluster. Since the age of the cluster is 1.34±0.06 Gyr, they are low mass stars in the main sequence or red giant phase. A blue straggler star is also present, along some spectroscopic binaries and variable stars.[5][6]

Notable stars

Name	Right ascension	Declination	Apparent magnitude (V)	Spectral type	Database references	Relevance
TYC 2816-327-1	01^h 56^m 08.9572^s	+37° 39' 52.7528"	10.41	F5.3V[5]	Simbad	Gamma Doradus variable
DS Andromedae	01^h 57^m 46.0561^s	+38° 04' 28.43112"	10.44 - 10.93 (variable)	F3IV-V + G0V (double)	Simbad	Beta Lyrae variable
BD+37 416	01^h 56^m 10.3002^s	+37° 45' 00.0301"	10.00	F2III	Simbad	Spectroscopic binary
BD+37 416B	01^h 56^m 11.1020^s	+37° 45' 11.3889"	11.19	F0	Simbad	Candidate companion of BD+37 416
TYC 2816-1390-1	01^h 56^m 12.8772^s	+38° 01' 43.1869"	10.88	F3V	Simbad	Spectroscopic binary
TYC 2319-568-1	01^h 56^m 57.5899^s	+37° 23' 20.6538"	10.6	F2V	Simbad	Spectroscopic binary
2MASS J01571216+3756048	01^h 57^m 12.1584^s	+37° 56' 04.7909"	11.9	G5.0V[5]	Simbad	Spectroscopic binary
BD+36 364	01^h 57^m 25.9968^s	+37° 43' 19.6966"	10.4	F2III	Simbad	Spectroscopic binary
QX Andromedae	01^h 57^m 57.7818^s	+37° 48' 22.4500"	11.28 - 11.50 (variable)	F5	Simbad	W Ursae Majoris variable
2MASS J01575883+3741269	01^h 57^m 58.8386^s	+37° 41' 26.9575"	12.31	F8	Simbad	Spectroscopic binary
TYC 2816-691-1	01^h 58^m 16.8604^s	+37° 38' 15.9955"	11.21	F5V	Simbad	Spectroscopic binary
V447 Andromedae	01^h 58^m 53.9322^s	+37° 34' 42.5263"	13.39	K3.0[5]	Simbad	RS Canum Venaticorum variable
BD+36 348	01^h 55^m 27.6831^s	+37° 34' 04.6482"	10.14	F2V	Simbad	Spectroscopic binary
BD+37 410	01^h 55^m 29.2926^s	+37° 50' 26.3171"	9.94	F4III	Simbad	Spectroscopic binary
BD+37 418	01^h 56^m 18.8954^s	+37° 58' 00.4602"	8.97	G9III	Simbad	Spectroscopic binary
HD 11812	01^h 56^m 49.7623^s	+38° 01' 21.6883"	9.13	F3V	Simbad	In the HD catalogue
HD 11811	01^h 56^m 50.4330^s	+38° 01' 58.1400"	8.91	G2V	Simbad	Spectroscopic binary
BD+37 431	01^h 57^m 36.2116^s	+37° 45' 10.1549"	9.85	F2III	Simbad	Spectroscopic binary
BD+36 367	01^h 57^m 37.3494^s	+37° 29' 27.6181"	9.75	A0III	Simbad	Blue straggler[6]
BD+36 368	01^h 57^m 37.5965^s	+37° 39' 37.9032"	8.85	K1III	Simbad	Spectroscopic binary
BD+37 439	01^h 57^m 59.3462^s	+37° 54' 53.9679"	9.85	F2III	Simbad	Spectroscopic binary
BD+37 444	01^h 58^m 36.8870^s	+37° 45' 10.7241"	9.62	F2V	Simbad	Spectroscopic binary
TYC 2816-771-1	01^h 58^m 40.0620^s	+37° 38' 05.2030"	12.43	F2V	Simbad	Spectroscopic binary
2MASS J01591990+3723230	01^h 59^m 19.8967^s	+37° 23' 23.0364"	12.893	–	Simbad	Spectroscopic binary

References

1. "NGC 752". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 February 2018.
2. Seligman, Courtney. "New General Catalogue objects: NGC 750 - 759". cseligman.com. Retrieved 10 February 2018.
3. Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
4. Frommert, Kronberg, SEDS: NGC 752
5. Agüeros, M. A.; Bowsher, E. C.; Bochanski, J. J.; Cargile, P. A.; Covey, K. R.; Douglas, S. T.; Kraus, A.; Kundert, A.; Law, N. M.; Ahmadi, A.; Arce, H. G. (July 2018). "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". The Astrophysical Journal. 862 (1): 33. arXiv:1804.02016. Bibcode:2018ApJ...862...33A. doi:10.3847/1538-4357/aac6ed.
6. Belloni, T.; Verbunt, F. (January 1996). "Soft X-rays from the intermediate-age open cluster NGC 752". Astronomy and Astrophysics. 305: 806. Bibcode:1996A&A...305..806B.

External links

• SEDS – NGC 752
• perseus.gr – NGC 752 in a hires LRGB CCD image
• NGC 752 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images