NGC 6649 - Misplaced Pages

Open cluster in the constellation Scutum

NGC 6649
NGC 6649 by PanSTARRS
Observation data (J2000 epoch)
Right ascension	18 33 26
Declination	−10° 23′ 56″
Distance	4,470 ly (1,370 pc)
Apparent magnitude (V)	8.9
Apparent dimensions (V)	5.0'
Physical characteristics
Estimated age	60 million years
Other designations	Collinder 384
Associations
Constellation	Scutum
See also: Open cluster, List of open clusters

NGC 6649 is an open cluster in the constellation Scutum. It was discovered by William Herschel on 10 July, 1787. The cluster is about 40–60 million years old and it is located 4,500 light years away. Cepheid variable V367 Scuti is a member of the cluster.

NGC 6649 is a rich cluster with more than a thousand members with apparent magnitude over 20 extending at a radial distance of about 21 arcminutes, with the core of the cluster having a radius of 2.4 arcminutes, which corresponds to 1.4 parsecs at the distance of the cluster. The tidal radius of the cluster is estimated to be 35.85±6.64 arcminutes, which corresponds to about 21 parsecs at the distance of the cluster, indicating a cluster with a dense core and an extended halo. Two smaller clusters have been detected in the vicinity of the cluster, forming a triple system.

The turnoff point of NGC 6649 is estimated to be at 4.8 M_☉, which corresponds to a spectral type of B5. A total of 59 stars are estimated to be of spectral type B, indicating an original star mass of about 2,600 M_☉. Two red supergiants are also members of the cluster based on the reddening, along with a Cepheid variable, V367 Scuti. Seven members of the cluster are found to be Be stars, and the cluster hosts two blue straggler star candidates. The metallicity of the cluster is estimated to be = +0.02 ± 0.07, slightly below the expected value based on the mean galactic gradient.

References

^ "NGC 6649". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-19.
^ "WEBDA: Open cluster page". webda.physics.muni.cz. Retrieved 16 June 2024.
^ Gao, Xinhua (9 November 2023). "A clustering (DBSCAN+GMM) investigation of the young open cluster NGC 6649". Monthly Notices of the Royal Astronomical Society. 527 (2): 1784–1793. doi:10.1093/mnras/stad3358.
Turner, D. G. (February 1981). "Comments on the Cluster Main Sequence Fitting Method - Part Two - a Reexamination of the Data for NGC6649 and the Cepheid V367-SCUTI". The Astronomical Journal. 86: 231. doi:10.1086/112878.
Walker, A. R.; David Laney, C. (1 January 1987). "CCD photometry of galactic clusters containing Cepheid variables - IV. NGC 6649". Monthly Notices of the Royal Astronomical Society. 224 (1): 61–74. doi:10.1093/mnras/224.1.61.
^ Alonso-Santiago, J.; Negueruela, I.; Marco, A.; Tabernero, H. M.; Castro, N. (December 2020). "Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55". Astronomy & Astrophysics. 644: A136. arXiv:2009.12418. doi:10.1051/0004-6361/202038495.
Mathew, Blesson; Subramaniam, Annapurni; Bhatt, Bhuwan Chandra (21 August 2008). "Be phenomenon in open clusters: results from a survey of emission-line stars in young open clusters". Monthly Notices of the Royal Astronomical Society. 388 (4): 1879–1888. arXiv:0804.1498. doi:10.1111/j.1365-2966.2008.13533.x.

External links

NGC 6649 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e New General Catalogue 6500 to 6999
6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999
Astronomical catalog List of NGC objects 6001–7000

New General Catalogue 6500 to 6999

Constellation of Scutum

Stars

Bayer	α β γ δ ε ζ η
Variable	R S UY V373 V452 V479
Other	BD-11 4672 CoRoT-16 CoRoT-17 IRC −10414 2MASS J18450079–1409036 PSR B1828−11 PSR B1829−10 PSR J1841−0500 WR 114 WR 119 WR 120 WR 121-16 Stephenson 2 DFK 1 RSGC1-F01 RSGC1-F02 IRAS 18357-0604 Stephenson 2 DFK 49

Exoplanets	BD-11 4672 b c CoRoT-16b CoRoT-17b

Star
clusters

NGC	6649 6712
Other	Alicante 7 Alicante 8 Alicante 10 Mercer 3 Messier 26 RSGC1 RSGC3 Stephenson 2 Wild Duck Cluster

Nebulae	IC 1295