NGC 752

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NGC 752
NGC 752.png
NGC 752
Observation data (J2000 epoch)
ConstellationAndromeda
Right ascension 01h 57m 41s[1]
Declination+37° 47.1′[1]
Distance1,300 ly[2] (400 pc)
Apparent magnitude (V)5.7[3]
Apparent dimensions (V)75′
Physical characteristics
Other designationsCaldwell 28
See also: Open cluster, List of open clusters
Map showing the location of 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]

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[edit]

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[edit]

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

References[edit]

  1. ^ a b "NGC 752". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 February 2018.
  2. ^ a b c Seligman, Courtney. "New General Catalogue objects: NGC 750 - 759". cseligman.com. Retrieved 10 February 2018.
  3. ^ a b Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  4. ^ Frommert, Kronberg, SEDS: NGC 752
  5. ^ a b c d 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. ^ a b 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[edit]

Coordinates: Sky map 01h 57m 55s, +37° 51′ 57″