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.[4]

NGC 752
NGC 752
Observation data (J2000 epoch)
Right ascension01h 57m 41s[1]
Declination+37° 47.1′[1]
Distance1,470 ly[2] (450 pc)
Apparent magnitude (V)5.7[3]
Apparent dimensions (V)75′
Physical characteristics
Other designationsCaldwell 28, Cr 23
Associations
ConstellationAndromeda
Map showing the location of NGC 752

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.[3][5]

Components

The most up-to-date research lists 302 stars as members of NGC 752.[2] Since the age of the cluster is 1.34±0.06 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.[6][7] The detached eclipsing binary DS Andromedae is a member of this cluster.[8]

Images
NGC 752
NGC 752

Notable stars
NameRight ascensionDeclinationApparent magnitude (V)Spectral typeDatabase referencesRelevance
TYC 2816-327-101h 56m 08.9572s+37° 39' 52.7528"10.41F5.3V[6]SimbadGamma Doradus variable
DS Andromedae01h 57m 46.0561s+38° 04' 28.43112"10.44 - 10.93 (variable)F3IV-V + G0V (double)SimbadBeta Lyrae variable
BD+37 41601h 56m 10.3002s+37° 45' 00.0301"10.00F2IIISimbadSpectroscopic binary
BD+37 416B01h 56m 11.1020s+37° 45' 11.3889"11.19F0SimbadCandidate companion of BD+37 416
TYC 2816-1390-101h 56m 12.8772s+38° 01' 43.1869"10.88F3VSimbadSpectroscopic binary
TYC 2319-568-101h 56m 57.5899s+37° 23' 20.6538"10.6F2VSimbadSpectroscopic binary
2MASS J01571216+375604801h 57m 12.1584s+37° 56' 04.7909"11.9G5.0V[6]SimbadSpectroscopic binary
BD+36 36401h 57m 25.9968s+37° 43' 19.6966"10.4F2IIISimbadSpectroscopic binary
QX Andromedae01h 57m 57.7818s+37° 48' 22.4500"11.28 - 11.50 (variable)F5SimbadW Ursae Majoris variable
2MASS J01575883+374126901h 57m 58.8386s+37° 41' 26.9575"12.31F8SimbadSpectroscopic binary
TYC 2816-691-101h 58m 16.8604s+37° 38' 15.9955"11.21F5VSimbadSpectroscopic binary
V447 Andromedae01h 58m 53.9322s+37° 34' 42.5263"13.39K3.0[6]SimbadRS Canum Venaticorum variable
BD+36 34801h 55m 27.6831s+37° 34' 04.6482"10.14F2VSimbadSpectroscopic binary
BD+37 41001h 55m 29.2926s+37° 50' 26.3171"9.94F4IIISimbadEclipsing binary[8]
BD+37 41801h 56m 18.8954s+37° 58' 00.4602"8.97G9IIISimbadSpectroscopic binary
HD 1181201h 56m 49.7623s+38° 01' 21.6883"9.13F3VSimbadIn the HD catalogue
HD 1181101h 56m 50.4330s+38° 01' 58.1400"8.91G2VSimbadSpectroscopic binary
BD+37 43101h 57m 36.2116s+37° 45' 10.1549"9.85F2IIISimbadSpectroscopic binary
BD+36 36701h 57m 37.3494s+37° 29' 27.6181"9.75A0IIISimbadBlue straggler[7]
BD+36 36801h 57m 37.5965s+37° 39' 37.9032"8.85K1IIISimbadSpectroscopic binary
BD+37 43901h 57m 59.3462s+37° 54' 53.9679"9.85F2IIISimbadSpectroscopic binary
BD+37 44401h 58m 36.8870s+37° 45' 10.7241"9.62F2VSimbadSpectroscopic binary
TYC 2816-771-101h 58m 40.0620s+37° 38' 05.2030"12.43F2VSimbadSpectroscopic binary
2MASS J01591990+372323001h 59m 19.8967s+37° 23' 23.0364"12.893–SimbadSpectroscopic binary

References
  1. "NGC 752". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 February 2018.
  2. Gaysin, Renat; Hojaev, Alisher (2022). Open cluster NGC752: Revision by GAIA EDR3 data. Cambridge Workshop on Cool Stars. p. 82. Bibcode:2022csss.confE..82G. doi:10.5281/zenodo.7481659.
  3. Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  4. Seligman, Courtney. "New General Catalogue objects: NGC 750 - 759". cseligman.com. Retrieved 10 February 2018.
  5. Frommert, Kronberg, SEDS: NGC 752
  6. 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. S2CID 119438236.
  7. 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.
  8. Sandquist, Eric L.; Buckner, Andrew J.; Shetrone, Matthew D.; Barden, Samuel C.; Pilachowski, Catherine A.; Deliyannis, Constantine P.; Harmer, Dianne; Mathieu, Robert; Meibom, Søren; Frandsen, Søren; Orosz, Jerome A. (2023). "Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752". The Astronomical Journal. 165 (1): 6. arXiv:2210.11649. Bibcode:2023AJ....165....6S. doi:10.3847/1538-3881/ac9c59. S2CID 253080539.
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