accessory pigment

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A pigment, such as a carotenoid, that absorbs light energy and transfers it to chlorophyll A.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany Any non-chlorophyll pigment present in a chloroplast that helps to absorb light but send all the energy to a chlorophyll.