Observations

Rainbow Star Spectroscope

Star spectra are separated into seven MAJOR classes, OBAFGKMLT. The star spectra on this page are shown within this order.

*Class*	*Surface Temperature*	*Spectral Characteristics*	*Examples*
O	28,000 - 50,000 K	Ionised helium; weak hydrogen lines	Naos, Alnilam
B	10,000 - 28,000 K	Neutral helium; stronger hydrogen lines	Bellatrix, Rigel, Spica
A	7,500 - 10,000 K	Strong hydrogen lines; magnesium, calcium, iron	Sirius, Castor, Vega
F	6,000 - 7,500 K	Weaker hydrogen lines; singly ionised and neutral metals	Canopus, Procyon
G	4,900 - 6,000 K	Ionised calcium strongest; weaker hydrogen	Sun, Capella
K	3,500 - 4,900 K	Neutral metals	Arcturus, Aldebaron
M	2,000 - 3,500 K	Neutral metals and molecules	Betelgeuse, Antares
L	1,300 - 2,000 K	Neutral alkali metals, hydrides
T	< 1,300 K	Methane and sodium adsorption

O Stars

B Stars

	Bellatrix Spectrum B2
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 2sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:08UT

	Alnath Spectrum B7
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 1sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:20UT

	Regulus Spectrum B7
This spectra is overlaid with the hydrogen lines from the spectrum of Regulus; the two 'O' lines are from oxygen in the earth's atmosphere. The same lines can be picked out on most of the spectra. Once you have picked out the hydrogen lines the spectra can be calibrated and the other elements showing as marks in the spectrum determined.	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 2sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:36UT

A Stars

	Eta Leo Spectrum A0
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 7sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:38UT

	Sirius Spectrum A1
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 5sec V poor seeing - cloud Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 04 22:07UT

	Castor Spectrum A2
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 4sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:31UT

	Denebola Spectrum A3
	Star Spectrum 1st Order Spread by switching off tracking on telescope for 15secs during exposure Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 21sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 22 22:13UT

	Epsilon Gemini Spectrum A3
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 10sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:26UT

F Stars

Zeta Leo
Spectrum F0

Star Spectrum
1st Order

Meade LX200GPS 10"
at f/6.3
+ Rainbow Optics Grating
+ Starlight Xpress MX7C
Exposure 21sec

Spectrum analysis using AIP4WIN
Plotted with 2 moving average with Excel

Dorridge, UK
2005 iii 06 20:47UT

G Stars

Epsilon Leo
Spectrum G0

Star Spectrum
1st Order

Meade LX200GPS 10"
at f/6.3
+ Rainbow Optics Grating
+ Starlight Xpress MX7C
Exposure 34sec

Spectrum analysis using AIP4WIN
Plotted with 2 moving average with Excel

Dorridge, UK
2005 iii 06 20:39UT

K Stars

	Gamma Leo Spectrum K0
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 10sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:43UT

	Pollux Spectrum K0
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 12sec V poor seeing - cloud Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 04 22:33UT

	Alphard Spectrum K3
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 11sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:59UT

	Aldebaran Spectrum K5
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 1sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:17UT

	Lambda Leo Spectrum K5
	Star Spectrum 1st Order Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 34sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 06 20:55UT

M Stars

	Betelgeuse Spectrum M2
	Star Spectrum 1st Order Meade LX200GPS 10" at f/10 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 0.1sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 ii 19 21:49UT

	Betelgeuse Spectrum M2
	Star Spectrum 1st Order Spread by switching off tracking on telescope for 15secs during exposure Meade LX200GPS 10" at f/10 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 21sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 ii 19 21:51UT

	Y Canum Venaticorum (La Superba) Spectrum C7
	Star Spectrum 1st Order Spread by switching off tracking on telescope for 15secs during exposure Meade LX200GPS 10" at f/6.3 + Rainbow Optics Grating + Starlight Xpress MX7C Exposure 21sec Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 22 22:20UT

Solar Spectrum

	Solar Spectrum
	Solar Spectrum Zero + 1st Order Reflection from head of sewing needle (shown at right of image) + Rainbow Optics Grating Canon EOS 10D 1/125sec f5.6 105mm Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 28 14:34UT

	Solar Spectrum
	Solar Spectrum 1st Order Visible part of above spectrum Reflection from head of sewing needle + Rainbow Optics Grating Canon EOS 10D 1/125sec f5.6 105mm Spectrum analysis using AIP4WIN Plotted with 2 moving average with Excel Dorridge, UK 2005 iii 28 14:34UT

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