Gore — On Knotvn Variable Stars. 183 



83. EViEGiNis — Frequently observed before 1832, and since 1844. 

 The Elements given in the Catalogue show, according to Schcinfeld, 

 marked and regular deviations in the maxima, sometimes amounting 

 to 17 days, and the minima show similar deviations to 14 days. He 

 gives, from Argelander, the formula : — 



Max. Ep. E= 1831. 9. 12-92 + 145<'-7242 E 



+ 8''-370 sin (3° 41' 17 E + 310° 15' 10"). 



The light curve also shows irregularities. 



84. E, MtrsciE. — A variable discovered at Cordoba. Its period is, 

 according to Gould, not far from 21^" 20"; magnitude at maximum 

 about 6" 6 and at minimum 7* 3 or 7*4. The minima precede the 

 maxima by 9 hours. Gould remarks that "its average brightness is 

 so near the limit of ordinary visibility in a clear sky at Cordoba, 

 that the small, regular fluctuations of its light place it every few 

 hours alternately within or beyond this limit." 



85. S TJks^ Majoms. — Schonfeld calls its colour " intensiv roth- 

 gelb," and considers that a small increase in the period has occurred 

 since an observation by Lalande, 1790, March 7. The light curve is 

 very variable ; and shortly before the maximum the increase of light 

 is subject to a marked retardation. Pogson states (M. N., December, 

 1876) that the increase and decrease of light are more equal in dura- 

 tion than in other variables; but Schonfeld finds the former to vary 

 between 77 and 125 days, and the latter between 104 and 152 days. 



86. IT ViEGiins. — Some of the maxima calculated from the ele- 

 ments show a variation up to 23 days, according to Schonfeld ; but 

 some minima are represented within 3 days. In the neighbourhood of 

 the maxima the light curve is very variable. A 10 m. star 7ip. 



87. W ViEGiNis. — Used as a comparison star for Y Yirginis, and 

 thus found to be variable by Schonfeld, and nearly simultaneously by 

 Auwers. Schonfeld considers the light changes very uniform ; al- 

 though Schmidt finds, from his observations in August, 1872, evidence 

 of a double maximum. 



88. Y YiKGiNis. — Elements derived by Schonfeld from 5 observed 

 maxima, since 1860, show deviations up to 10 days. Increase from 

 10m., 35 days, with marked fluctuations; decrease 51 days, much 

 more uniform. Colour, " stark gelbroth." 



89. R Htdk^. — This remarkable variable star Avas first observed 

 by Hevelius in April, 1662. It varies at the maximum from 4 to 

 5-5 m., and, at the minimum, descends to about the 10th magnitude. 

 The period has, according to Schonfeld, diminished since the date of 



2A2 



