NGC 188

Number of stars per data source

	Reference    1 :    1 star
	Reference   63 :    4 stars
	Reference   67 :   11 stars

References

 1

Keenan P.C.

(1942) Astrophys. J. 95, 461

Luminosities of the M-type variables of small range

1942ApJ....95..461K

 63

Sandage A.R.

(1962) Astrophys. J. 135, 333

Photometric data for the old galactic cluster NGC 188

1962ApJ...135..333S

 67

Greenstein J.L., Keenan P.C.

(1964) Astrophys. J. 140, 673

A spectroscopic study of NGC 188

1964ApJ...140..673G