458 The Spectrum of rj Argus. 



The wave-lengths given in the object-glass prism table were derived 

 from careful measures which were converted into wave-lengths by 

 Hartmann's formula and the known wave-length of the hydrogen lines. 



The wave-lengths resulting from the object-glass prism are naturally 

 far less reliable than those from the slit spectroscope. 



From the very exact agreement between the spectrum of y] Argus 

 and that of the Nova Aurigae, it appears that whatever the causes of 

 the origin of the Nova in Auriga, very similar causes have probably 

 produced the historical changes in the brightness of rj Argus. 



Table. 



Spectrum of 77 Argus. 

 Measures from slit spectrograph. 



Correspond- 

 ing bright 

 lines in spec- 

 trum of 

 Nova Aurigse. 



r) Argus 

 (objective prism). 



Com- 

 parison. 

 Micro- 

 meter. 

 E. 



Spectrum. 



Spectrum of rj Argus. 



A 



Corected 



for 

 displace- 

 ment. 



. 



P= Potsdam. 

 L = Lick. 

 A 





Int. 



Pe 



Micro- 

 meter. 



A 



Int. 



A. 



63-4193 

 54-6904 



4957 '68 

 4630 -90 



62 -6624 

 61 -1187 

 59 -8889 

 57 '5872 



4925 -9 

 4863 '38110 

 4815 -6 

 4730 -5 



"6 

 40 

 2 

 2 



4924 -2 

 4861 -49 

 4813 -5 

 4828 -2 



P 4923 

 P 4862 Hj3 



5018 -2 

 4924 -5 

 4861-49 

 4811 -6 

 4727 *0 



2 

 4 

 40 

 1 



3 br. 



f 54 -6896 

 \54 -4117 



4630 -90 

 4622 -00 



54-6871 

 54 -4070 

 53 -2965 

 52 -859(5 

 52 -4900 

 52 -2008 

 51 -6428 

 51 -2971 

 51 -0199 

 50 -7851 

 50 -5527 

 50 -2154 



4630 -9 

 4621 -7 

 4585 -9 

 4572 -1 

 4560 -5 

 4551 "5 

 4534 -4 

 4523 -9 

 4515 -6 

 4508 -6 

 4501 -7 

 4491 -7 



4 

 2 

 7 

 3 

 6 

 7 

 4 

 5 

 2 

 2 

 1 

 4 



4628 -5 

 4619 -3 

 4583-4 

 4569 -6 

 4558 -0 

 4549 -0 

 4531 "8 

 4521 -3 

 4513 -0 

 4506 -0 

 4499 -1 



P 4628 



P 4583 

 L 4570 

 P 4557 

 L 4549 

 P 4530 

 P 4520 



L 4490 



4665 -8 

 4627 *6 



4583 -4 



4552 -2 

 4518-8 



4487 "7 



3 v. br. 



8 



7 



— 

 v. v. b. 



5 v. br. 







49 '6058 



4474 -0 



1 



4471 -3 



L+P 4472 



4472 -4 









2 





f 47 -5260 

 \ 47 -1436 



4415 -33 

 4404-94 



49 -4519 

 49 -1225 

 48 -9977 

 48 -7287 

 48 -5516 

 47 -5599 



4469 -5 

 4460-1 

 4456 -5 

 4448 -9 

 4444 -0 

 4416 -3 



1 



2 

 2 

 2 

 2 

 10 



4466 -8 

 4457 -4 

 4453 -9 

 4446 -2 

 4441 -3 

 4413-6 



P 4445 

 P 4417 ? 



4441 *6 

 4414 -0 



10 



f 47-1424 

 \ 46 -3547 

 J 44*1345 

 \ 43 -4232 



4404 -94 

 4383 -72 

 4325 -98 

 4308 '02 



45 -4700 

 45 -1883 

 44 -8215 



4360 -7 

 4353 -3 

 4343-71 Htf 



9 

 6 

 10 



4357 -5 

 4350 -2 

 4340 -66 



L 4355 

 L 4340 Hy 



4395 *8 

 4360 -3 

 4354 -5 

 4340 -66 



3 

 1 

 20 

 20 



J 43*1062 

 1 42 -9005 

 J42 -4178 

 141 -9777 



4299 -44 

 4294 -32 

 4282 -54 

 4271 -68 



42 -6890 

 42 -2246 



4289 -1 

 •4277-7 



9 

 3 



4286 -1 

 4274 -7 





4300 -9 

 4286 -0 

 4275 -3 



4 

 10 



3 



/ 41*5002 

 1 41 -0769 

 f 40 -0791 

 \39 -7487 



4260 -67 

 4250 -65 

 4227 -65 

 4219 -52 



40 -8929 

 40 -4445 



4245 -8 

 4235 -3 



7 

 5 



4242 "7 

 4232 -2 





4242 *4 

 4232 -2 



7 

 7 



f 36-3117 

 135-1127 



4144-01 

 4118-72 







Sus- 

 pected 



3 





P 4176 

 L4166P4158 



4174 -8 

 4164-4 



6 br. 



("32 -7827 

 (.32 -3631 



4071 -84 

 4063 -75 



34 -5930 

 34 -4388 



4108 -2| 

 4105 -08 m 



} 4105*0 

 4101 *S5 



L&P HS 



4101 -85 

 4067 -0 



8 

 1 



br = broad ; v. br. = very broad. 



