Gore — On Knoivn Variable Stars. 



205 



teristic ; and this line was not seen at all when the spectrum was very- 

 bright. [See note at end]. 



At Lord Lindsay's observatory the position of the l^ova with respect 

 to above 50 closely adjacent stars has been micrometrically de- 

 termined. 



179. fx Cephei. — Sir "W". Herschel's " garnet star." It seems to 

 have been observed by Ptolemy. Argelander considered its variability 

 beyond doubt, but Schonfeld thinks it questionable. He gives, how- 

 ever, the following Elements : — 



Ep. E. Min. 1855. 10. 15-6, Max. 1856.6.20-1 + 431'i-786 E 



as probably an approximation to the truth. Owing to its very red 

 colour, it is difficult of observation. 



Erom comparisons with e, X and 10 Cephei, I estimated the magni- 

 tude of fjL Cephei as follows : — 



April 6th, 1878, 

 Jan. 12th, 1882, 

 Mar. 17th, 1883, 

 April 8th, 1883, 

 April 20th, 1883, 

 Sept. 4th, 1883, 

 Dec. 30th, 1883, 



4-7 m 



4-8 



4-3 



4-9 



4-8 



5.1 



4-7 



180. T Pegasi. — Argelander found that the observations from 

 1822 to 1864 would be well represented by a period of 374 days ; but 

 Schonfeld finds that, neglecting observations before 1864, the data 

 since that time are represented by the period given in the Catalogue 

 within about 5 days, and show a small lengthening of the period since 

 1864. The star seems to remain for a long time at 11 m., especially 

 at the increase . 



181. 8 Cephei. — According to Schonfeld the period and light 

 curve show considerable irregularities, the calculated times of maxima 

 and minima sometimes requiring a correction of over an hour. Arge- 

 lander's light curve shows a check in the decrease of light 16 to 24 

 hours after the maximum, and Schonfeld' s observations show the same, 

 but of shorter duration. 



182. IT Aquarii. — Though long since notified as a variable star, it 

 seems to have been little observed. It was invisible on November 9th, 

 1874. It was estimated 9 m. at Markree on October 27th, 1848, and 

 it was of the same brightness in August, 1855. It is not in Lalande's 

 Catalogue. 



