What are the 7 spectral types?
What are the 7 spectral types?
The 7 Main Spectral Types of Stars:
- O (Blue) (10 Lacerta)
- B (Blue) (Rigel)
- A (Blue) (Sirius)
- F (Blue/White) (Procyon)
- G (White/Yellow) (Sun)
- K (Orange/Red) (Arcturus)
- M (Red) (Betelgeuse)
What do the spectral classes Obafgkm indicate?
OBAFGKM and more. Each spectral type is divided into 10 subclasses, A0, A1, A2, A9 etc. The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9).
What are the different types of spectral classes?
Harvard spectral classification
| Class | Effective temperature | Main-sequence mass (solar masses) |
|---|---|---|
| B | 10,000–30,000 K | 2.1–16 M ☉ |
| A | 7,500–10,000 K | 1.4–2.1 M ☉ |
| F | 6,000–7,500 K | 1.04–1.4 M ☉ |
| G | 5,200–6,000 K | 0.8–1.04 M ☉ |
How many spectral types are there in obafgkm?
The seven main spectral types OBAFGKM are shown above with the spectrum of a single “O” star at the top followed by two spectra each from the progressively cooler designations, respectively.
How many spectral types are there in a star?
A few types that best describe the temperatureof the star remain in use today. The seven main spectral typesOBAFGKM are shown abovewith the spectrum of a single “O” star at the top followed by two spectraeach from the progressively cooler designations, respectively.
When did the use of spectral types start?
First started in the 1800s, the spectral type was originally meant to classify the strength of hydrogen absorption lines . A few types that best describe the temperature of the star remain in use today.
Who are the authors of the Yerkes spectral classification?
Yerkes spectral classification. Montage of false color spectra for main sequence stars. The Yerkes spectral classification, also called the MKK system from the authors’ initials, is a system of stellar spectral classification introduced in 1943 by William Wilson Morgan, Philip C. Keenan, and Edith Kellman from Yerkes Observatory.