NGC 884

Number of stars per data source

	Reference   57 :    5 stars
	Reference   69 :    3 stars

57: Pigulski A., Jerzykiewicz M., Kopacki G.; (1997) Acta Astron. 47, 365; A CCD search for variable stars of spectral B in the northern hemisphere open clusters. II. NGC 7235; 1997AcA....47..365P
69: Pierce M.J., Jurcevic J.S., Crabtree D.; (2000) Mon. Not. R. Astron. Soc. 313, 271; Period-luminosity relations for the red supergiant variables - I. The calibration; 2000MNRAS.313..271P