ON THE SPECTRUM OF y CYGNI. 
207 
Comparative Intensities of the Strongest Metallic Lines in y Cygni and the 
Chromosphere. 
Strongest arc 
lines. 
A. 
Intensity. 
Strongest arc 
lines. 
A. 
Origin. 
Intensity. 
Origin. 
y Cygni. 
Ma.\. = 10. 
Chromo¬ 
sphere. 
Max. = 10. 
y Cygni. 
Max. = 10. 
Chromo¬ 
sphere. 
Max. = 10. 
r 401.5-98 
Ee 
8 
7 
4528-80 
Fe 
4 
3 
1 4063-76 
Fe 
8 
6-7 
4030 - 92 
Mn 
5 
5 
U071-91 
Fe 
5 
6 
4033-22 
Mn 
4 
3-4 
4132-24 
Fe 
5-6 
3 
3995-46 
Co 
5 
3-4 
4144-04 
Fe 
8 
5-6 
4226-90 
Ca 
8 
7 
4202-20 
Fe 
5 
3 
3989-91 
Ti 
4 
2-3 
4260-64 
Fe 
6 
4 
3998-79 
Ti 
5 
4 
. 4271-33 
Fe 
6 \ 
1 Pi 
3944-16 
A1 
3-4 
5 
4271-93 
Fe 
6 J 
ht—D 
3961-67 
A1 
5-6 
6 
r4383-72 
Fe 
4-5 
5 
4554-21 
Ba 
5-6 
7-8 
\ 4404-93 
Fe 
3-4 
4 
4254-51 
Cr 
4 
6 
[.4415-29 
Fe 
5-6 
4 
4274-96 
Cr 
4 
5 
These intensities cannot he accepted as absolute, but as the same limits (1 to 10) 
are used in the two spectra, it may be conceded that the intensities are roughly 
comparable. It will be noticed that in tlie majority of cases the lines appear to 
be somewhat weaker in the chromosphere than in y Cygni. Notable exceptions, 
however, to this are the lines of aluminium, chromium, and barium. 
In the next table, the intensities of the more prominent enhanced lines of iron, 
magnesium, chromium, titanium, and strontium are similarly compared. 
Comparative Intensities of Enhanced Lines in y Cygni and the Chromosphere. 
Enhanced lines. 
A. 
Origin. 
Intensity. 
Enhanced lines. 
A. 
Origin. 
Intensity. i 
j 
y Cygni. 
Max. = 10. 
Chromo¬ 
sphere. 
Max. = 10. 
y Cygni. 
Max. = 10. 
1 
Chromo¬ 
sphere. 
Max. = 10. 
4233-33 
]) Fe 
7-8 
6-7 
4399-94 
p Ti 
,5-6 
5-6 
74.508-46 
Fe 
4 
5 
4443-98 
p Ti 
9 
7 
4515-51 
p Fe 
4 
4 
4450-65 
p Ti 
4 
5 
^ i 
4520 - 40 
p Fe 
3 
3 
4468 - 66 
p Ti 
6 
6 
4522-69 
p Fe 
4 
4 
4501-45 
p Ti 
6 
7 
4549-64 
p Fe 
8 
7-8 
4534-14 
p Ti 
6 
7-8 
4584-02 
y Fe 
8 
7 
4549-81 
p Ti 
8 
7-8 ! 
3900-68 
p Ti 
4-5 
4 
4563-94 
p Ti 
4-5 
7-8 ! 
3913-61 
p Ti 
4 
6 
4572-16 
p Ti 
6-7 
7 
4012-54 
pTi 
5 
5-6 
4558 - 83 
p Cr 
3 
3-4 ; 
4161-68 
p Ti 
6-7 
3 
4588-38 
p Cr 
3 
3 
4163-82 
p Ti 
5-6 
4 
4077-89 
p Sr 
8 
10 
4300-21 
p Ti 
6 
5 
4215-70 
p Sr 
9 
10 
4321-20 
p Ti 
8 
5 
4481-30 
p Mg 
5-6 
— 
4338-08 
p Ti 
9 
5 
